HGBase Code (Desktop)

Added some file tools.

HGBaseText: Method to get the available languages.
MenuBuilder: Set the available languages based on the languages in the menu file.

Extracted the display of the error message when opening a file into a separate method.

Removed unnecessary argument for getClone.

Add generally usable undo stack.

Color chooser: possibility to get null instead of the default color if no color is selected.

getAttributeRGBColorValue: return no color if the given string is to short.

Possibility to set the preferred width of the color label.

Set the configuration item as source of the action event.

Method to extract a color from a RGB value.