return blocks from empty chunks
fix a few nasty bugs, opengl resources get released again!
individual loglevel/writer for NamedLogger
implement logger.log_exception
fix compilation in utils.log
fix formatstring
fix grass and crafting table
seed prng once
less work for the GC
fix is_valid_position
implement block.name
implement sliding along edges, instead of preventing movement
fix delta_ticks?
revert to old queue, mutex.lock took up to 700ms
fix furnace
cleanup queue
lock already acquired
set default tessellation threads to 1
remove "block cache" in Physics.move
remove POST_BUILD_CMD from makefile