Add static geometry support for worker mode

Based on a commission from jomego, added static geometry support for worker animation mode and also support for animation in general. If the animation rate is below the refresh rate (e.g. 60Hz refresh and 20 fps animation or 30 fps animation), performance should further improve when using static geometry. Please test and report back results.

A good rule of thumb now for performance is to use worker mode for animation, run at 20-30fps animation rate and enable static geometry.

In the future, I will change the name to 'buffer geometry' since it works with both animated models and non-animated models.

Know issues with 'static geometry' mode

• Instance textures will not be displayed properly (will be fixed in future releases)
• Texture offset / rotation will not have an effect (more difficult to fix, for now, if texture offset/rotation is needed, do not set the model to 'static geometry')