Fix special tile backspace culling
Add [colorize modifier
Fix object reference pushing functions when called from coroutines
Add a better error message when trying to teleport another player without bring privileges
Add in-game key change menu
Fix use of unitialized variables in mouse button handling
Change topleft text when switching subgames, fixes #1728
Fix unit reported by TimeTaker (was always ms)
Make sure PRECISION_SECONDS corresponds to the integer 0
update games/default
Merge commit '28438bb'

Conflicts:
	src/guiFormSpecMenu.cpp
	src/util/string.cpp
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'minetest/master'

Conflicts:
	src/util/timetaker.cpp
Merge remote-tracking branch 'upstream/master' into next

Conflicts:
	src/guiFormSpecMenu.cpp
	src/util/string.cpp