Graphical Optimizations

[NEstelami]

As previously discussed on Discord, there are several changes on the graphical side that could improve performance. They are listed below:

• Currently we use gSPInvalidateTexCache to invalidate certain textures from Fast3D's texture cache. This tends to be done every frame in the draw functions without regard for if a texture has actually changed or not. @Rozelette has proposed that the invalidation be moved into the game logic, specifically being done in functions that directly modify those textures. This would make the code a bit cleaner and ensure that textures are only being invalidated when they are actually modified.
• The N64 only had a buffer big enough to store 32 vertices at a time. So display lists would spend a notable amount of time loading 32 vertex chunks and drawing them. Since we do not have this limitation, we can increase the buffer to whatever size we like and draw everything in one go.
• On N64, various pipeline syncing functions were used. These are not needed on Fast3D and do not do anything, so they can be removed.

This list will be updated as further optimizations are proposed and implemented.