Fixed an issue where the shader builder would incorrectly succeed when the .azsl file is missing.
Also renamed some variables for more consistency.
Updated all .shader files accordingly.
Signed-off-by: santorac <55155825+santorac@users.noreply.github.com>
Added a ShaderSystem supervariant to provide a system-wide supervariant name.
Changed ShaderAsset to append the system-wide supervariant name when searching for supervariants.
Added the NoMSAA supervariant to several shaders.