Another try at fixing lingering auto-capitalization issues
added Steve McMahon's Perlin Noise class

useful for a variety of functions and filters
New "figured glass" (dents in Paint.Net) distort

Very pretty; I quite like this one
Completely overhauled menu icon handler

Menu icons are now loaded and placed by a single call.  This is much
more organized than the previous (default) method, and it has the
ENORMOUS benefit of not requiring me to manually track the ID of every
loaded icon.

It also means I could finally clear out a number of old, unused icons.
Completely rewritten "Fog" filter

Perlin noise is now used for high-quality, much more realistic fog.