Update the info displayed in the playlist when you change the play mode in the menu (had this ever worked ?)

* Fix two cases where p_playlist->status.p_item was NULL (this fixes last issues with adding shoutcast SD to OSX playlist)

* different way to remember fullscreen state.
* update the playlist on item-append and item-deleted calls.
* fixed video-on-top with opengl vouts on OSX.

* intf.* : try to restore an a bit more intelligent behavior for the playlist toggle button (remeber previous state, for instance)
* misc.* : get rid of unused code.

Rempaces 95 by [o_window minSize].height everywhere. That fixes some visual bugs ans should help keep consistancy.

Please test if I didn't break anything...

stable playlist

TODO: Added some todo items related to playlist that should be done, but I don't have time to do right now.

Apparently menu's got smarter in Tiger. As a workaround for the old version, you should first open the Help menu and then drag to the other menu's.

This still isn't the correct way to fix it. We should attach a callback function to the autogenerated menu's and have the callback function update the menu. (but this will work for now).

I only changed two things in the patch 
* added a check for wx2.4 that does not seem to have sizer->Detach
* commented out the wxCheckVersion in open.cpp, which broke layouting under wx2.5.3
  (what was the intended behaviour ?)

* Added core support for a sorted by genre view

rest: new services discovery module to get channels from shoutcast

title

playlist/item-ext.c: O(log(N)) playlist_GetItemById()

Add Track length mode. 
Entry slider fixed update fixed.
Some small memory leaks fixed.