added different rendering options for when game window is not focused

[iZePlayzYT]

this is like the "Mute When Window Unfocused" audio setting but for the graphics. it highly reduces the ram, cpu and gpu usage while unfocused.

[Isaac0-dev]

I'm really skeptical about adding this because some mods rely on the rendering hooks being called.

[iZePlayzYT]

@Isaac0-dev do you have any ideas how i can improve it?

[Isaac0-dev]

still run geo_process_root as normal? perhaps interpolation could be disabled instead, since that wouldn't change how often hooks are called