Matter 1.4 constraint support

[lauckhart]

Moves sign handling from lexer to parser which I would consider a bug fix although it didn't affect any expressions prior to 1.4.

Adds support for codepoint limits on strings. This is a new feature for 1.4.

Adds additional tests.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
packages/model/src/aspects/Constraint.ts	23% smaller
packages/model/src/parser/Lexer.ts	18% smaller
packages/node/src/behavior/state/validation/constraint.ts	8% smaller
packages/model/test/aspects/ConstraintTest.ts	6% smaller
packages/node/test/behavior/state/validation/constraintTest.ts	1% smaller
CHANGELOG.md	Unsupported file format
packages/model/src/parser/Token.ts	0% smaller