math: add world box to screenspace calc function (from tiledlight)
math: add world box to screenspace calc function (from tiledlight)

zenmumbler/libzm,zenmumbler/stardazed-tx,stardazed/stardazed,stardazed/stardazed-tx,stardazed/stardazed-tx,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx,zenmumbler/libzm,zenmumbler/libzm,stardazed/stardazed-tx,zenmumbler/libzm,stardazed/stardazed