stdlib fixes for Vulkan (#414)

* stdlib fixes for Vulkan

- Make sure to emit `image*` instead of `texture*` for `RWTexture*` types
- Change `GetDimensions` to call `imageSize` instead of `textureSize` when we use images
- Always output a `layout(rgba32f)` for variables that translate to `image` types
  - TODO: we should emit an appropriate format based on the type, or let the user specify one
- Fix GLSL translation for `any()` function (required boolean inputs)
- Add GLSL translation for `GroupMemoryBarrierWithGroupSync()`
- Map HLSL `groupshared` to GLSL `shared`

These together are enough to get the Falor `ComputeShader` example to work.

* fixup for warning

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