bring back tile overrendering (so you can't see where the rendering ends)

don't round the camera anymore as that causes (unsurpsingly given our unit
system now), jittering.
make torch light radius in meters
don't round entity position in spritesheet (entity) renderer, for obvious

reasons due to our recent changes. now torches are visible in the world
fix lighting renderer usage of the camera

now the light renderer scales properly with zoom