Fix VS build.
thread-safe UniqueQueue
center pause menu
Pass light sources in blue channel of vertex color instead of decoded light for all special drawtypes.
Plus some style fixes and optimizations.
Merge remote-tracking branch 'minetest/master'

Conflicts:
	src/content_mapblock.cpp
	src/mapblock_mesh.cpp
rename mg_heat -> mgv7_np_heat
Remove buildable_to nodes without dropping item when replaced by a falling node
Merge remote-tracking branch 'minetest/master'

Conflicts:
	builtin/game/falling.lua
Fix wrong Icon name in minetest.desktop
Merge remote-tracking branch 'minetest/master'

Conflicts:
	misc/freeminer.desktop
slower move in liquid depend on liquid level (ugly version)
Merge remote-tracking branch 'upstream/master' into next

Conflicts:
	src/util/container.h