libHgWidgets TODO

o TextBrowser/TextEditor: pass Style instead of WidgetKit in constructor?

o Tear-off Menus

o Cannot paste from a TextEditor into itself?!

o FieldEditor(Browser?): maximum number of characters

o move X_Context/X_Window from ImageViewer/FilmPlayer to Widgets

o FieldSlider: allow switch off of range check for typed-in values

o TextEditor: handle \r as \n
