Offline Player Cache: Directors Cut

Additions 🍎

• Hey, hey, I figured out how to do a multi-loader project! (sorta)
• This update is compatible for (hopefully) all loaders.

Changes 🌽

• Rewrote the cache (again).
  • The cache now uses a record-based system for registering with a provided Codec.
  • Register your record using OfflinePlayerCacheAPI#register.
  • Get your cache using OfflinePlayerCacheAPI#getCache.
• Proper documentation will arrive upon release.