app: add gimp_color_panel_dialog_response(); add "response" signal
Add gimp_color_panel_dialong_response() to GimpColorPanel, which emits a response for the color panel's color dialog, if shown. Add a "response" signal to GimpColorPanel, which is emitted upon color dialog response. In both cases, the response is a GimpColorDialogState, which should be either GIMP_COLOR_DIALOG_OK or GIMP_COLOR_DIALOG_CANCEL, and not an actual dialog response id.
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