Fix leaking global in texture pack menu
Simplify loading of Android version of menu
Mgv5 get ground level at point function. Fast spawn player version
Mgv5 1 up 1 down overgeneration for biome surface continuity
Optimise getTileInfo()

getTileInfo() ~1.5x faster
getSmoothLight ~2.0x faster
Optimise functions from CNodeDefManager and VoxelManipulator

CNodeDefManager::get()
VoxelManipulator::addArea()
Merge branch 'master' of github.com:minetest/minetest into merge

Conflicts:
	builtin/mainmenu/init.lua
	src/defaultsettings.cpp