Subsdec: Split the decoder for subsdec / SSA / USF in three files, since the code has grown a bit too much in order to improve readability.
Some functions may still need to be renamed and moved from a file to another.
I hope it is done in the correct way, if not, tell me or revert.

control/media_instance.c: Support libvlc_MediaInstanceReachedEnd event for upcoming media_list_player.

Patch by Ilkka Ollakka

Yes, some sites use empty usernames

Patch by Hannes Domani
THANKS updated.

Closes #1249

Patch by Alexander Gall. Thanks.

This needs to be *reviewed*.

spotted by David Thiel

(bug reported by David Thiel)

 - Removed the gross SUPPRESSED hack
 - Remove support for strict deprecated aliases (that was not used anyway)

Note that shortcuts are inherited from the main module to submodules, so it is
totally useless to duplicate them paste add_submodule. If you think this is
wrong, I do not necessarily disagree, but it would need a RFC.