modules/gui/beos/InterfaceWindow.h/.cpp

modules/gui/beos/InterfaceWindow.h/.cpp

	- improved file loading:
		- contents of sub folders can optionally be loaded too
		- files are loaded in expected order from filepanel
			_and_ drag'n'drop
		- file panel accepts folders to load
	- saving of playlist's display mode
	- added updating of interface when playlist is modified
		while nothing is playing
	- added compatibility for SoundPlay's drag'n'drop message format

modules/gui/beos/ListViews.h/.cpp

	- implemented reversal of playlist
	- list can display full path or file name only
	- drag'n'drop interaction with SoundPlay

modules/gui/beos/MediaControlView.cpp

	- cosmetic fix

modules/gui/beos/PlayListWindow.h/.cpp

	- added reverse sort command to edit menu
	- added view menu, to allow the user to display paths
		or only names in the list