Use JavaFX directory chooser instead of Swing directory chooser in Swing modules

[Oliver-Loeffler]

The JavaFX directory chooser works way better than the old Swing directory chooser. Replace Swing directory chooser with JavaFX directory chooser.

Consider generalization to make both interchangeable.

[Oliver-Loeffler]

Provide Swing-Wrapper API to access the JavaFX FileChooser and Directory chooser, while keeping modality and configurability (e.g. file extensions).

[Oliver-Loeffler]

There exists now a DirectoryChooser which is implemented in JavaFX and works very similar to how the FileChooser works. It only shows a tree of drives/shares and directories, allows selecting those per typing + return key. This version works from within the same window as the file chooser. Configuration of the JavaFX directory chooser or Swing directory chooser is still possible. However, problems with modality between Swing and JavaFX remain.