Fixed a bug with the size estimation/measurement code; also implemented
the first pass of map-based is_loading checking.

-Peter Mawhorter
Implemented Worley noise and gradient mapping for texture generation,
but there are still some bugs to work out.

-Peter Mawhorter
Got Worley noise working at a basic level.

-Peter Mawhorter
Got Worley noise working, including a wrapped version suitable for
generating tilable textures.

-Peter Mawhorter
Played around with Worley noise a bit. Probably going to have several
versions of the algorithm to achieve different effects.

-Peter Mawhorter