Automatic Projection Baking

[carson-katri]

This adds an option to automatically bake the generated texture to a different UV map. It should only bake the selected faces, so a future PR can merge multiple baked generations together and blend the seams.

I also re-implemented the depth rendering to use GPUOffScreen instead of adding a callback and updating.

Note: You need to be in face select mode with the target faces selected so it can identify which faces need to be baked.

[NullSenseStudio]

That actually worked. I wish it occurred to me to try removing those lines instead of just changing their parameters.

[carson-katri]

I changed the default prompt structure to 'Custom', as many users default leave the 'Texture' preset selected when they aren't generating textures.