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This implies the removal of playlist support (single-file playing only, through set_mrl/get_mrl methods). Position parameters for _pause, _resume and _stop method have also been removed.

This improves readability a lot and prevent us from reinventing the wheel.

 * prefix non-exported function names with private_ (as by Pierre d'Herbemont's suggestion)
 * move private functions definitions to src/control/mediacontrol_internal.h
 * move all structure definitions to include/vlc/mediacontrol_structure.h

Thanks to sam and pdherbemont (blame them too if this breaks everything!)

mediacontrol API: split old mediacontrol_exception_init behaviour into mediacontrol_exception_create/mediacontrol_exception_init

include/vlc/mediacontrol.h, src/control/mediacontrol_audio_video.c: implement get_/set_rate and get_/set_fullscreen

Fix compilation

header from internal headers. 
Patch elaborated with Olivier Aubert.

 using vlc_object_id instead of a direct p_object pointer as parameter
 for mediacontrol_new_from_object

* include/vlc/vlc.h, include/vlc/control.h, src/control/util.c: introduced vlc_int64_t in the libvlc headers instead of using long long which isn't portable + fixed a function prototype in control.h. Thanks to Brian Robb (vascy at hotmail) for pointing out the problem.

(da big courmischage)