Until now, options could be accessed as properties via "options/name",
but the access was read-only. Change it so that write access is possible
in --idle mode. (All options have to support setting options at that
time, simply because of the way MPlayer designed per-file options.
During playback, normal properties take care of changing things,
including things backed by options.)
This is work in progress. There are some issues: at least setting the
"vf" and "af" options won't work for strange reasons.
This includes the case of passing multiple files to command line
(internally this is the same as loading a playlist).
Resuming works by finding the first playlist entry that can be resumed.
Alternative implementations would be possible, such as hashing the
playlist contents. But this implementation is simpler, and doesn't have
the disadvantage that changes to the playlist (like appending entries)
will throw away the resume point.
This makes loading large playlists a bit slower, because it has to look
into ~/.mpv/watch_later/ for every entry. Loading a 15000 entries
playlist now increases from 150ms to 400ms. Considering you rarely load
playlists this big with mpv (because it's impractical considering the
terminal and non-GUI nature of the player), this is probably ok.
core is used in many unix systems for core dumps. For that reason some tools
work under the assumption that the file is indeed a core dump (for example
autoconf does this).
This commit just renames the files. The following one will change all the
includes to fix compilation. This is done this way because git has a easier
time tracing file changes if there is a pure rename commit.
