DeathCube

- routine for version check will now run in an asynchronous task to prevent lags
- dc set/get will work for global key now
- remove items after cube creation (for idiots that place torches or something like that in the blockbar)
- added /dc clear to remove the upper part of the cube if you decrease its height
- posTowerId option to set the block for the position marks
- activeRedstone toggle to keep redstone within the cube triggered (for redstone lamps as marks eg)
- fix: protectionBar-message fixed
- fix: tunnel will be destroyed when time starts burning
- advertiseTournament message