Added support for vec4 uniform parameters to IECoreGL::Shader.
Added support for vec4 uniform parameters to IECoreGL::Shader.

Alwnikrotikz/cortex-vfx,AlanZatarain/cortex-vfx,tectronics/cortex-vfx,tectronics/cortex-vfx,AlanZatarain/cortex-vfx,Alwnikrotikz/cortex-vfx,AlanZatarain/cortex-vfx,tectronics/cortex-vfx,Alwnikrotikz/cortex-vfx