added copying of weapon sets

Finally a solution for excess lazyness when working with unsafeThaw'ed arrays

Merge henek's changes

Send spectators info

removing all " " in filenames under share and replacing "_" with " " in missions

Apply rev b9fe93f187c4 to server rewrite too

disable fix for issue #24 in order to fix issue 123, as suggested by koda

Send teams info on join

added MapHasBorder function for lua and finnished Random Weapons gameplay, might still change though

Switch default to the compost garbage ball (pending a proper mudball from a real artist), set Snowball for Snow theme only, change en.txt to Mudball

Updated Slovak translation + merge

Send room config to client

- Allow user to use undo, to clear, save and load drawn maps - Fix a couple of bugs related to those operations

Another approach for fixing listener thread issues, should finally get rid of all problems. Not tested.