Unfinished save/load in Palette
Load does nothing
Save lets you pick image formats, IMO it should restrict to palette-only formats. Similarly, palette-only formats should not be proposed in file selectors for image and brush : This would save some space in the "formats" dropdown list, which is already too long (it crashes if the dropdown exceeds the window bottom, and the file selector is dragged to the bottom).
By the way, it would be very helpful if loading a palette would ask the user if he wants to remap the image (new) or not.