chunk boundary bug fixes
shader tweaks for lighting
added simplex noise seed function
only show player name in crosshairs if they are near
bug fix in db.c
put ao value in uv attribute
set_block bug fix
server set_block fix
perf improvement in gen_chunk_buffer via reduced map_get calls
cleanup
minor fixes
check for invalid _set_block calls temporarily
Merge branch 'master' into mipmap