* ./modules/gui/macosx/controls.m:

* ./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