This adds several script-opts to configure what OSC buttons do when
clicked. It lets you restore the bindings present before they were
changed to call select.lua.
The script-opts are listed one per line in the manual to not make that
section huge.
skip_backward and skip_forward script-opts are omitted to lower the
script-opts number because they are only in box layout and undocumented.
I'm not sure if it's worth adding script-opts for the wheel on the
seekbar.
script-opts for the current and remaining time and fullscreen are not
added to not add more script messages.
Closes#6291 and #11878.
