Get rid of deprecate warnings

[ryuukk]

Many community packages depend on this library, and it contains a ton of 'deprecated' warnings

It should be cleaned up before it causes problems once the warnings will become errors

C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(936,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(950,18): Deprecation: reference to local variable `this` assigned to non-scope `(*this.left).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(951,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(908,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(922,19): Deprecation: reference to local variable `this` assigned to non-scope `(*this.right).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(923,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(936,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(950,18): Deprecation: reference to local variable `this` assigned to non-scope `(*this.left).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(951,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(908,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(922,19): Deprecation: reference to local variable `this` assigned to non-scope `(*this.right).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(923,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(936,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(950,18): Deprecation: reference to local variable `this` assigned to non-scope `(*this.left).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(951,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(908,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(922,19): Deprecation: reference to local variable `this` assigned to non-scope `(*this.right).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(923,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(936,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(950,18): Deprecation: reference to local variable `this` assigned to non-scope `(*this.left).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(951,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(908,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(922,19): Deprecation: reference to local variable `this` assigned to non-scope `(*this.right).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(923,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(936,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(950,18): Deprecation: reference to local variable `this` assigned to non-scope `(*this.left).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(951,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(908,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(922,19): Deprecation: reference to local variable `this` assigned to non-scope `(*this.right).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(923,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(936,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(950,18): Deprecation: reference to local variable `this` assigned to non-scope `(*this.left).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(951,19): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).right`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(908,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(922,19): Deprecation: reference to local variable `this` assigned to non-scope `(*this.right).parent`
C:\Users\ryuukk\AppData\Local\dub\packages\emsi_containers-0.9.0\emsi_containers\src\containers\ttree.d(923,18): Deprecation: reference to local variable `this` assigned to non-scope `(*newRoot).left`