!IB (Renderer) Fixes vulkan shader cache generation. The encoded resource layout...

!IB (Renderer) Fixes vulkan shader cache generation. The encoded resource layout size is reduced by half. It is base64 encoded and sent with request line to remote shader compiler. This way the resource layout description which is needed for vulkan shader compilation is known during shader cache generation.
!IR (Renderer) Replacing r_shadersorbis, r_shadersdx10, r_shadersdx11, r_shadersGL4, r_shadersGLES3, r_shadersdurango, r_shadersVulkan CVars with r_ShaderTarget CVar which specifies the target which shaders must be built for.

Copied from Perforce
 Change: 1666566