* update NEWS

* src/libvlc.c, src/playlist/services_discovery.c: fixed --services-discovery and --extraintf to use the new modules list syntax.

src/libvlc.c,include/vlc/vlc.h, include/variables.h: added a new a API to libvlc called VLC_VariableType, this API allows to retrieve the type of a VLC variable. this API is very useful for binding with highlevel languages, such as javascript, VBScript, etc... which allow for weakly typed variables such as Javascript. in order to support the VLC_VariableType API, i've had to move the variable type definitions from variables.h to vlc/vlc.h

vlccontrol.cpp, axvlc.idl, axvlc.tlb, axvlc_idl.h: added a getVariable and setVariable to provide support for VLC_GetVariable and VLC_SetVariable respectively,and requires the new VLC_VariableType API.

main.cpp, viewobject.h, viewobject.cpp: support for advise on viewobject

* Transmit keyboard events from the arrow and enter key to the main controller, so that playlist navigation with the keyboard is possible.
* This doesn't conflict with dvd menu navigation.
* If these keys are set to an action that is handled by Cocoa, this action will have priority.

* src/*, modules/gui/wxwindows/*: audio/video/sub-filter config options are now a colon (':') separated list of filters to keep the same syntax as the stream output.

Move MACOS_VERSION macro to intf.h

+ fix hotkeys widget with macos < 10.3