* ./modules/gui/macosx/controls.m:
- Added a volumeslider
- removed pause button
- added a fast forward action (increases speed in time)
- changed the play method to allow for a toggled play pause button
- volumeUp and VolumeDown take the state of the Mute Menuitem into account
- volumeUp and VolumeDown take the volumeSlider into account
* ./modules/gui/macosx/intf.h:
- added references for the volumeslider, new menuitems
* ./modules/gui/macosx/intf.m:
- correct init of volumeslider and other new intf elements
- new title for Controller window
- the state of buttons is dependant on a movie being played
- toggle the play/pause button if a play/pause action is detected.
* ./modules/gui/macosx/playlist.h: added add/remove buttons to playlist
* ./modules/gui/macosx/vout.m:
- removed some control keys which were no longer necesarry
- give the window the title of the item being played