format

Until we have some amount of type inference, an integer literal used as a constant array size must have a `u` suffix. This is inconsistent with the surface syntax presented in the spec, and is a minor inconvenience.

For now, allow a signed integer array size to pass validation so that user code need not change when type inference deduces values of the correct type.

* [glsl-in] Add initial support for glslpp-rs

* [glsl-in] Add remaining Punct mappings

Fix some tests.

* [glsl-in] Add basic error handling for glslpp-rs

* [glsl-in] Fix clippy issues

* [glsl.in] Add pp-rs floats

* [glsl-in] Remove old lex and preprocessor

* [glsl-in] Improve lexer token code

* [glsl-in] Rename lex_pp > lex

Also LexerPP > Lexer

* [glsl-in] glslpp-rs review feedback

* [glsl-in] Use rev for pp-rs dep

* [glsl-in] Parse on lexer err

format

Uses the GlobalUse in glsl-out to check for function availability