Fix memleak + event leak on wince if thread creation fails

Skins2 dll gets a bit smaller.

At least, ES track switching became really slow (the data for the associated
ES are not buffered as the decoder is not present).

There is still a problem when the Gui itself has "on top" set.

Pointed-out-by: Jean-Baptiste Kempf

This fixes always-on-top going away when toggling full-screen and back.

We were accessing some main interface variables from random threads
without serialization. This simply moves the blocking connection signal
from sole size setting to the whole video widget request call. In the
process, we can remove two signals. We still need a blocking connection
signal. It does not add any new deadlock case, since there was already
blocking connection signal in the same call and in the same direction.

(Otherwise we would be in trouble whenever VLC crashes)

Remove repeated code

The call was broken, but still worked, but only half-way...

Remove the ShowIntf module. It doesn't make sense when MacOS and Qt gui have a fullscreen controller.

Fix build on Win32

This patch fixes the crash when a node is selected together with it's children and then deleted
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

There is a slight ambiguity as to what VOUT_WINDOW_SET_SIZE should do
when in full-screen mode though.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Drop enabled only inside Playlist and Media player, not Podcast and
other Internet sources...
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>