Fix jcButton text rendering for multiline captions

He wasn't taking picture size into account, so text was overlapping
button images.  <shakes head>
Remove unnecessary debug code
Redesign Transparency preferences panel as Color and Transparency

Color management settings will be placed here.  Perhaps not the greatest
organizational scheme, but I didn't want to include a new panel just for
color management, and it is highly unlikely that I'll ever include more
Transparency settings, so this panel can at least be used more
efficiently now.

(And this organization is still more logical than Photoshop's
"Transparency and Gamut". :)