Remove m_ext_ptr in GUIFormSpecMenu, replaced by refcount mechanism
Add NodeResolver and clean up node name -> content ID resolution system
Add support for eased 3d noise
Merge remote-tracking branch 'minetest/master'

Conflicts:
	src/biome.cpp
	src/guiFormSpecMenu.cpp
	src/noise.cpp
	src/noise.h
	src/script/lua_api/l_mapgen.cpp
fix merge
fixes
remove m_time_of_day_f to reduce data race
Change license of noise implementation to Simplified BSD
Prevent invalid memory access under failure conditions
Add NodeResolver documentation

Set content to fallback on AddNode failure
Consider node list requests with no results as failed
Merge remote-tracking branch 'minetest/master'

Conflicts:
	src/biome.h
	src/noise.cpp
	src/noise.h