Rework texture generating code, add texture grouping via ( ... )
Add ZLIBWAPI_DLL and LEVELDB_DLL CMake options Remove legacy MINGWM10_DLL CMake option Update 32-bit buildbot (OpenAL updated, zlib updated) Change build directory for buildbots to '_build' to prevent removal of Android build files Use -win64 suffix for 64-bit Windows builds Fixes #1476
Fix issue 1527
https://github.com/minetest/minetest/issues/1527
Merge remote-tracking branch 'minetest/master'

Conflicts:
	CMakeLists.txt
	README.txt
	src/CMakeLists.txt
	src/tile.cpp