Modified color_get_*() so they do not need "imgtype" parameter.
ColorBar class is public (defined in colbar.h).
Added ColorBar::Fg/BgColorChange signals.
Converted palette editor widget to a C++ class (PalEdit derived from Widget).
Modified the "Palette Editor" (F4 key) to be non-modal (still WIP).
Modified its implementation to use std::vector<> instead of a raw C array[].
Now the number of colors in the sprite is more relevant (e.g. we should be able to create sprites of 4bpp, 16 colors).
Refactored jwidget_set_text to Widget::setText (same for setFont, setEnabled, etc.).
Created "Frame" class.
Refactored "jwindow_funcname" functions to "Frame::funcname".
Renamed JWidgetPtr to FramePtr.