options: don't make options set during playback file local (e.g. --vf)

Refactor file local options handling: instead of making all options
implicitly file local between loading a file and terminating playback,
explicitly make options file local which are required to be file local.

Or in other words, introduce a M_SETOPT_BACKUP flag, which forces file
local-ness when setting an option, and use this for file local command
line options, per-file config files, and per-protocol/extension/vo/ao
profiles.

In particular, this changes the "vf" input command such that video
filters stay permanent even when going to the next file in the playlist.
The underlying reason for this is that the "vf" command uses the option
setting command. This influences the "af" command as well.

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