Pl3xMarkers

Major rewrite and cleanup

• Changed storage to use JSON instead of SQLite
• Added a config with options to toggle layers and change options like max area size and layer priority
  • The config can be reloaded alongside Pl3xMap using the /pl3xmap reload command
• Added feedback in the form of action messages and sounds when placing/removing markers or points

!! Warning !!

This storage rewrite is not backwards compatible with previous versions of the plugin. All existing markers and areas will be lost upon updating to this version.