* Verify shaders are valid
* Verify images are valid
* Verify models are valid
* Verify materials are valid
* Verify textures are valid
* Verify render textures are valid
* Verify waves are valid
* Verify sounds are valid
* Verify music is valid
* Verify audio streams are valid
* Verify fonts are valid
* Update examples to handle error unions
This commit affects the build.zig and examples files. It reformats the
code to meet a 120 column limit. It also adjusts comments so that
there is a space after the comment symbol '//' and the grammar in the
comments has been fixed.