Add isUnbreakable and setUnbreakable to ItemMeta. Also fixes a bug where it doesn't show up on items
Remove inv close patch for now
Limit TNT Detonations per tick

This gives a per-world control on how much TNT will be processed per-tick,
preventing a massive TNT detonation from lagging out the server.
Revert unbreakable API, doesn't work as intended
Use sane default config values
Improvements to Player Lookup

Minecraft and CraftBukkit both use Arrays to store online players,
and any time a player needs to be looked up by name or UUID,
the system iterates all online players and does a name or UUID comparison.

This is very ineffecient and can reduce performance on servers with high player count.

By using a map based approach for player lookups, player lookup should
be consistent in performance regardless of how many players are online.