macosx: Modernize and fix shared dialog panels
Splits PopupPanel and TextfieldPanel into two xib files and creates NSWindowController subclasses for each panel. Each user of the panel gets its own window controller instance. This is needed as the same kind of window can be shown multiple times simultaneously (e.g. both in video and audio effects). This also did not work with the previous implementation of the 2.2 branch and fixes broken behaviour.
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