Lightman's Discord Integration

-Updated JDA to 5.0.0-beta.12 -Reworked how message entries are registered. They are now actually registered in the MessageEntriesEvent instead of using it to force a class load. -Made internal changes to avoid any mods that extend this mod from having to update whenever Discord and/or the JDA makes changes. Note: Reworks will keep other mods that use older versions of this from loading properly.