enable directml

[HPPinata]

This should broaden our compatibility, although with significantly worse performance than native libraries.

ToDo:
Worse Performance shold be documented and advised against, before announcing this.

The PR still needs the knobs and dials to only enable directml under certain conditions, easiest would be an eqivalent to --amd and then maybe another initialization script?

Or maybe think about a way to properly detect what plattform we are running on and go from there?
Having 4 different update-runtime scripts mostly doing the same is getting a bit out of hand...

[HPPinata]

@tazlin here I'd like a thorough review.
I don't really know what I'm doing in Python, so this is basically just copy/paste and google-fu.

I got it to a state where it works locally, but only if I set safety_on_gpu: false and as I already mentioned Flux.1 also doesn't work because of the datatypes it's using.

The update.cmd and bridge.cmd scripts are copy/pastes of the cuda version with minimally different requirements/arguments (this could potentially be solved more elegantly...)

I'll write some user documentation when I know the core logic is actually working as best it can.
Speed and VRAM usage is still atrocious, but that can be tackled later (if there even is a fix for that at all...).

As for the commit history: I can clean that up before the merge, everything up to pass directml is essentially testing whether it works at all, everything after is me trying to do things "properly"