* Add interpolation support to naga core and wgsl

* Add glsl-new fragment shader support to examples/convert.rs

* Add interpolation support to glsl_new

* Add interpolation support to spirv frontend

* Add interpolation support to spirv backend

* Add interpolation support to glsl backend

* Add interpolation support to old glsl backend

* Fix interpolation field syntax in glsl backend

* Formatting fix

* thanks clippy

* Add wgsl struct interpolation decoration

* Change wgsl interpolation syntax

* Modify interpolation enum

* Changes responding to review

* Remove interpolation struct member qualifier

* code changes after review

* Add support for array stride to wgsl frontend

* rename

* Make type handling more generic in glsl-new

* Remove commented-out code

* Add more scalar and vector types to glsl-new

* Formatting

* Add support for initialization of local variables to glsl backend

* Cleanup

* [glsl-new] Handle local vars scopes

* [glsl-new] scope fixes

- Check loacl vars before globals

- Rename add_scope > push_scope

- Remove unnecessary ref in lookup functions

* Add serialize and deserialize features with examples

* Fix formatting

* Make some types (de)serialize transparently

* Fix more formatting

* Remove new examples and add (de)serialization support to the convert example

* Remove extraneous file

* Rename param file

* Initial backend implementation

* Refractored glsl450 backend to have a common module between further glsl backends
Implemented more missing functionality

* Error handling

* Implemented most of the suggestions

* Addresed all comments
Fixed some bugs

* Made code style consistent

- Fix clippy issues

Focus on handling global in/out vars

Add mat2x3, mat2x4, mat3x2, mat3x4, mat4x2, and mat4x3 keywords

- Initial work for handling expressions that also generates statements

* [glsl-new] Add initial handling of stmts and exprs

* [glsl-new] use &'static str for NotImplemented msg

* [glsl-new] Don't lazy create function context

* [msl] Cast single-component scalars

* [msl] Allow `BinaryOperator::And`

* [glsl-new] handle gl_Position builtin

- Also fix width of vec4 type

* [glsl-new] add shader stage as arg to program ctor

* Fix TokenMetadata for #version

* Add glsl-new #version parsing

* Fix clippy issues

* glsl-new only core profile, allow 440-460

* Cleanup glsl-new profile matching

Adds constant evaluation for addition, and uses it for globals and array
specifiers.

* Add inital ast for glsl-new

* Fix clippy for glsl-new

Deref instead of cloning

Previously the lexer would accept any alphanumeric character as part of an
identifier. The spec only allowes identifiers to consist of ASCII alphanumeric
characters though.