Clarify comments
New class for detailed font and text management and rendering

Eventually I'm going to have to implement some kind of text tool, so I
thought I'd start laying the foundation for it.  Thus this text and font
management class.

At present, the class's emphasizes providing a simple way to manage font
attributes, create an API font, select that font into a DC (with color
and alignment), then do high-performance rendering to that DC.

For sample output and usage, see the About form.
Rewrite About dialog against new pdFont class

The new "credit scroll" aspect of the About dialog provided a great test
bed for the new pdFont handler.  Performance is much improved over pure
VB, probably because VB has to recreate a font object every time a
single parameter is changed.

Setting up and using the font object is very simple, and the About
dialog LOC was cut by some 25% thanks to this new approach.