Updated version numbers for 2.3.0
Inviting offline players should work again.
Cleaned up code for adding plots to territs in TerritHandler

Trying to use a non-cuboid and non-poly WE selection type will now tell the user they're not supported, instead of throwing a runtimeexception
OH LOOK SOMETHING ELSE THAT STILL SAYS "DISTRICTS"

I swear to God I'll never get rid of all of this.

That said, I'm still too lazy to just grep through the whole codebase for it.
Reverted version numbers after merging bugfix from branch dev