1.2.1 - polishment?

• The plugin is now built Gradle (KTS)
• Reworked caching
• Refactored small parts of the code
• Removed "onlyPlayers" option because it didn't affect anything and.. well.. You can just disable "broadcastTamedMobsDeaths"
• Changed the death messages processing to replace all instances of placeholders.
• Added placeholders "", "". Don't worry, you can still use "(victim)" and "(damager)"
• Death messages no longer logs with "§x" for the console
• Removed the SOOOOOOO useless Bukkit version check.
• Players quitting now removes their cache entry
• Fixed double instances of Listener in PluginManager