Code cleanup, distribution of responsibility.

• No longer do I have built-in routines for determining hit renderers, it's up to you to figure out which colliders belong to what renderers!
• You may now request textures of specific formats and modes. For example if you wanted to do signed distance fields you may want an R8, LINEAR mode texture.
• Inside out models now cause an editor-only error message that helps determine why decals aren't rendering.