[Renderers] Add ability to negotiate capabilities with the renderer

[EmmanuelMess]

If the renderer is incapable of showing 3D textures, or drawing specific elements, like some colors (for example monocrome interfaces), clay should be able to take that into account, and inform the final user. This would probably become more important if new rendering commands are added to simplify the rendering.

[EmmanuelMess]

Also, hover might not be available on devices with no cursors (touchscreens, SoC connected to a screen).

[nicbarker]

This is a really interesting idea, do you have a particular approach in mind that you're envisioning?