Fix paralax occlusion setting
Move script_run_callbacks to Lua
Dungeongen: Create dungeon gen tuneables; add desert temples for Mapgen V6
EmergeManager: Fix Lua mapgen override param handling
Fix leak and possible segfault in minetest.set_mapgen_params
Fix shaders on some GPUs
Merge remote-tracking branch 'minetest/master'

Conflicts:
	src/mapgen_v6.cpp
Update games/default