Got bulb leaves working (uninitialized Bezier curve z values were a
problem).

-Peter Mawhorter
Moved texture-related functions to their own module.

-Peter Mawhorter
Found a new shoreline spot, although this one is unfortunately without
sand.

-Peter Mawhorter
Got a very basic leaves filter working and revised the bulb leaves
filter to make it much better.

-Peter Mawhorter