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This code is unfinished, and is commited as a Proof-of-Concept
If people agree on it, we will go on this experiment, else revert.
A lot of the code is broken, you are warned.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This should help a lot the future work.

And cleanup includes of StandardPanel

Remove friendship
Factorisation of CoverArt
Reduction of class footprints
virtual and protected correctness
Forward declaration when possible

So that you don't kill the lua.sd search() functions

Change visible-root to currents parent so it's visible. Not sure if
it's best way to do it, but atleast you don't get lost why isn't current
item visible on playlist in tree-mode.

This patch ensures that _all_ menus/actions have got a parent widget that
is guaranteed to be deleted.

This patch
   - solves memory leaks for menus and action(children)
   - solves a side effect (crash) pointed out
     by 193e6eac where
     some vlc objects were no longer properly released for lack
     of a clean menus/actions release chain.

MainInterface:
  Use same settings context when creating and deleting playlistWidget
  Make beginGroup() / endGroup() pairs explicit.
StandardPLPanel:
  Use same settings context whenever creating treeView

This makes drag-and-drop easier, because drag-and-drop pixmap does not
cover the area under mouse cursor.

close #3343

...without reference. With a direct connection, the call stack ensures
that the pointer remains valid until the slot returns. This is not the
case for asynchronous ("queued" in Qt4 documentation) signals.

Obviously, this means we have to emit the signals from the Qt4 main loop
thread, *or* alternatively not touch any Qt4 UI stuff fromt he slot.
Hopefully, any such bug would be easier to find this ways.

Instead it shows a "..." button which opens a menu with those locations.
Current location is thus always displayed as wide as possible.

I think it works better thisway, but you're free to change it if you think
otherwise.

- searchLineEdit: proper clearing
- locationBar content will not affect searchLineEdit size

- keep root index of views when searching
- clear search when browsing or changing view
- layout and geometry fine tuning