Feature req: Cache textures by server/resource pack.

[NolanSyKinsley]

Currently dense ores generates the textures on every startup. It makes sense to generate them once and store them by resource pack so they can then just be loaded on startup rather than generated. I play on a server with a lot of mods, cutting any time at all off the startup process is very important when the startup time is reaching over 3 minutes.

[rwtema]

Generating the texture should take no more than a few milliseconds so caching would be pointless.