Bukkit

Adds integration with Discord
Implements relational placeholder color %rel_simpleclans_color%
Adds command /clan resign confirm
Adds /clan toggle invite (#244)
Adds /clan list balance command
Marks annoying provider messages as debug
Fixes StaffCommands#demote for permanent feature
Replaces Threads with BukkitTasks on MySQLCore
Suppresses exceptions on GriefPreventionProvider #237
Removes deprecated methods in Helper.java
New config value: settings.global-friendly-fire
ClanPlayer#setMuted and ClanPlayer#setMutedAlly was moved to ClanPlayer#mute
Fixes spy ally chat having the same format as clan chat #160
Updates maven dependencies: bStats, JetBrain Annotations and JUnit
Returns message after conversation expiring
Checks if user has already played in the server before saving to db
Changes tasks to be sync