Add TextureRenderer to GraphicsTools

[TheMostDiligent]

In SSR we found a problem that depth textures can't be copied to color textures in GL and Vulkan. This is currently solved in SSR by rendering a textured quad. This functionality is general enough to be added as a separate helper tool class to GraphicsTools.

The class should be unit tested so that we are sure it works as expected.

• Documentation
• Unit tests