Add Physical Layout test

Add Instruction tests

Add Logical Layout test

* Add glsl handling to convert sample

- Also fis extension check for spv and wgsl (missing .)

* Use std::path::Path for ext handling

* Also fix ext for .comp

Missing from last commit

* Basic glsl support

* Miscellaneous fixes and vertex shader works

* Added rudimentary texture and sampler support

* Basic preprocessor

* Added preprocessor if macros

* Pass tests and handle floats correctly

* Fix preprocessor if wrong precedence ordering when using macros
Refractor for the glsl parser
Partial primary expression parser

* Fix all clippy errors

* Cleanup

* Rollback formatting changes in lib.rs

* Move from travis to github actions (#58)

* Added github actions

* Remove travis

* Fixed clippy warnings

* Add the clippy check to ci

* Move workflows to .github

* Fix missing clippy

* Check constant types

A baby step towards #43

* Move tp src/proc/typifier, remove unneeded return

* Don't do pub(crate)

* Don't use crate::proc::UnexpectedConstantTypeError

Co-authored-by: Paul Kernfeld <paulkernfeld@gmail.com>

Fixes #31

A step towards #31