* Disable parallax texture preloading
Many parallax layers are specific to a single map and will likely never be loaded for the duration of the game. Save VRAM by not loading them always.
Requires engine master
* Put generated parallax identifier in texture name
Makes it show up properly in debugging tools
* Don't load generated parallaxes multiple times
Many parallax prototypes re-use the same generated parallax configs. These generated parallaxes were being loaded multiple times at once, which was a massive waste of VRAM.
We now move these into a separate cache for deduplication. I had to write a lot of logic to handle loading cancellation and ref counting. Yay.
Also fixes some spaghetti with the previous parallax loading system: cancellation didn't work properly, give proper names to generated texture names, etc.
This saves like 100+ MB of VRAM.
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