Content-aware resize: convert to grayscale before generating energy map
Content-aware resize: improve ESC-to-Cancel behavior
pdFont: fix bad hDC detection

Signed data types strike again, argh!
GDI+ Round Rect function: add optional parameter for drawing unfilled rects
Adjustments > Channel > Rechannel: fix tabstop order

This is my "test option button" dialog, so I've had frequent occasion to
use it lately.
Radio button UC: many optimizations and improvements

- Text now glows on mouse hover
- When focus is received via keyboard, a custom focus rect is now drawn
around the focused control.  Rect is automatically cleared upon mouse
entrance or focus loss.
- Space bar can now be used to set state to TRUE, if control receives
focus via keyboard
- Manual handling of WM_PAINT + manual rect validation seems to have
solved flicker and over-painting issues (tested on XP, 7, and 8, so
hopefully all's well)