Item entity stacks merge on the ground.

Add TTL to item entities.
Fix a bunch of small bugs due to mainmenu cleanup
Fix doubleclick not working in singleplayer
Fix of by one issue on accessing raw list
Fix this->self
Fix copy&paste error for scroll button
fixed typo std::encl in src/gettext.cpp
Fix disable hud disabling drawing of full gui
Remove settings not used any longer
Merge remote-tracking branch 'upstream/master'