Make window larger
Enable prefs buttons

They don't seem to work at the moment...
Add defaults for icon size and hide label in Deskbar

Note we don't support getting or changing those yet.
They aren't exposed by BDeskbar.
backgrounds: Fix launching prefs
deskbar: Fix launching prefs
terminal: Implement launching prefs

We make sure Terminal is running and fake a menu click.
haikuui: Fix launching prefs
screensaver: Fix launching prefs
haikuwindowdecor: Fix launching prefs
sounds: Fix launching prefs
pe: Implement launching prefs