Konquest Pull Request

Closes #152

Summary

Public release v1.2.0. Includes minor bug fixes and new features.

Bug Fixes
- Fixed town protections of entities like paintings, item frames, and armor stands so that non-resident players cannot break them.
- Language files now correctly get saved with a .bad extension when they have invalid YAML syntax. Any config file with invalid syntax will be saved with a .bad extension, and the default version of the file will be used.
- Improved player kingdom membership checks when SQL database connection is corrupt or unavailable. Players will no longer be marked as a Barbarian while being members of kingdoms/towns.
Minor Features
- Added ARENA property for Ruins and Sanctuaries. Also added konquest-arena flag for WorldGuard regions. This allows any player to pvp in the territory/region, regardless of kingdom relationship.
- Added sub-command "/k admin ruin reset (name)", which will reset the ruin by re-generating all critical blocks, and re-spawning all Ruin Golems.
- Added core.yml option loot_after_capture, which will only spawn loot in chests after the ruin has been captured.
- Added sub-commands for joining and leaving kingdoms and towns, which do the same thing as the existing GUI menu methods.
- Command "/k kingdom join (name)" lets the player request to join a kingdom.
- Command "/k kingdom exile" lets the player leave their kingdom to become a barbarian.
- Command "/k town (name) join" lets the player request to join a town.
- Command "/k town (name) leave" lets the player leave the specified town to stop being a resident.

[x] I have merged the latest develop commit into this branch and resolved any conflicts.
[x] I have tested this branch and it is working as intended.
[x] This Pull Request is ready for review and merging.