fixup Sky and Time, add sun.png, much better version

add textures/LICENSE, we'll update this beacuse not every art piece
will have the same license
lets get started on the sky rendering...
sky->skyrenderer
fix the skyrenderer's matrices

presently it can only render the sun or the moon, never both due to some
issues with the DrawRange
create celestialBodies.png spritesheet.

generalize the renderer and in general, make it not so fugly
sun is renderable now

add a separate debug area for e.g. Debug::fatal, because it's something
that needs to be outputted all the time, regardless of debug area's
(ImportantArea, it is called).
make the world's time tick, from 0-24:59, move the sun according to angle

i think it should actually be 23:59
Time goes from 23:59 -> 0, instead of 24:59