VLCMediaPlayer: VLCMediaPlayerState: Remove ESAdded/Deleted

LGTM, it's not part of the "media player state" and should not be there. It should emit a separate event instead, which can be done later.

I'm not sure to understand the purpose of this MR. Why would a media player event in the libvlc sense not be a media player event in the VLCKit sense? Shouldn't it be the same?

What is tricky is that all libvlc_*Event are events in the libvlc meaning. But not all libvlc_*Event are state changes.

In particular, EsAdded/Removed doesn't match with a state (@bubu might link the content of the documentation¹) so they don't notify state changes, but they notify events.

The correct way to notify those is through a new callback in the VLCKit media player wrapper, and considering it like a state would break client state machine code across platforms.