game: disable z-buffer to make bsp order failure obvious
editor: add base implementation of bsp2
bsp2: implement split statistics
editor: implement findBestPlane and show best plane found
editor: fix splitting by non-splitting planes
editor: begin implementing split in bsp2
editor: implement checkWalls in bsp2
editor: first full partitioning attempts with bsp2
editor: after some cleanup and bugfix bsp2 finds its first leave
editor: implement saving bsp2
game: implement loading bsp2, bsp _is_ correct now
editor: fix twosided lines in bsp2
editor: fix texture coordinates in bsp2
game: use z-buffer write-only for map and read-write for objects
editor: compute intersection point more precisely in bsp2
map: trigger partitioning bug
editor: turn intersection assert into exception
add simplified map without outsiders
bsp: try fixing numeric instability
bsp2: save neighbour sector with walls