LlmDl's 5.4 Update (Holograms!)

• Adds holographicdisplay as a softdepends.
  • If enabled in the config, and HolographicDisplays is present then rather than a sign on top of a deathchest, a hologram with the same information will be spawned.
  • Holograms are stored in a new holograms.db which is saved to on shutdown as well as after a tombblock is made.
  • Holograms are loaded at startup.
• Moved some more stuff out of the EntityListener and into CenotaphUtil.
• Moved all plugin-handling classes into a PluginHandlers package.
• Fix missing admin check when opening secured chests.
• Moved database related things to CenotaphDatabase.java
• New Command: /cenadmin deletehologram
  • Removes nearby cenotaph holograms that may not have a cenotaph anymore.
  • Requires user to be in same chunk and within 5 blocks of the hologram.
  • Requires cenotaph.admin.deletehologram permission node.