input: add support for pointer options to input item
Pointers cannot be inherited as normal configuration item for somewhat obvious reasons. For output parameters, this is not much of an issue as LibVLC sets the pointer values directly on its media player object. But for input-related parameters, LibVLC would need to store pointer values in the media item. Thus this change to input items. Note that pointers are considered intrinsically unsafe, so there are no flags for the time being.
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