[Bug 746012] gl: add GstGLDisplayCocoa to handle NSApp initialization

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746012

--- Comment #5 from Julien Isorce <julien.isorce at gmail.com> ---
Created attachment 299305
  --> https://bugzilla.gnome.org/attachment.cgi?id=299305&action=edit
gl: add GstGLDisplayCocoa

As there is only one overall display, I made GstGLDisplayCocoa a kind of
singleton. So gst_gl_display_cocoa_new just gives you the same instance all the
time. It supports to reset it once ref count goes to 0.

With the recent changes (glupload is back :) ) it needs a bit more testing.

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