added themeing support for declarations

[Carlyle-Foster]

both the semantic tokens and the TextMate grammar can now distinguish the initial declarations of variable and constants from their uses. i tried to keep backwards compatibility with existing themes as much as possible, so in some cases where meta. scopes were being used incorrectly to refer to concrete tokens i kept them but added correct scopes as well (it's also quite possible that my understanding of TextMate naming conventions is just incomplete)

[Carlyle-Foster]

i forgot there's a test suite, the unit tests have already helped me find a few bugs in the semantics tokens code, i should have this wrangled soon enough though

[Carlyle-Foster]

keyword_lut_init() in core:odin/tokenizer at line 85 is crashing nondeterministicly when i run tests, but i think that's an unrelated race condition? there's also some warning from analysis.odin:1558:internal_resolve_type_expression()

[Carlyle-Foster]

at least the tests are passing

[Carlyle-Foster]

keyword_lut_init() in core:odin/tokenizer at line 85 is crashing nondeterministicly when i run tests, but i think that's an unrelated race condition? there's also some warning from analysis.odin:1558:internal_resolve_type_expression()

the panic in core:odin/tokenizer is indeed a known race condition, not my problem i guess