Various ui fixes: - panel drawing now correctly follows scaled view - made imagewindow buttons using TH_PANEL color back (was too dark) - click on open/close panel was wrong - menu items disabling now draws correct - curve/hsv widgets didn't draw on right locations - numsliders have nicer interior slider decoration - new type TOGBUT to enforce old style toggle button (not new type 'option button' with checkmark - (temp) disabled live updating while using Curve widget, was too slow to be fun. Needs general solution :)