options: change handling of "no-" options yet again

Commit 4a40eed "options: change handling of "no-" options" generally
improved the handling of automatically added negation options
(recognizing "--no-opt", even though only "--opt" is declared in the
option list).

Unfortunately, one corner case was missed, which broke the option
"--input=no-default-bindings" (other suboptions, e.g. VO suboptions,
were not affected, and this is the only option where this mattered).

Instead of increasing the complexity further, use a completely different
approach: add the "--no-" options at runtime, and make them behave like
real options. This approach could be considered slightly less elegant,
because the code now has to worry about some option implementation
details rather than leaving it to the parser, but all in all the new
code is simpler and there are less weird corner cases to worry about.
osd: always update already visible OSD bar on seeks

Seeks can be performed with OSD bar invisible (e.g. "osd-msg seek ..."
command), and then an already visible bar won't be updated. But the bar
will stick around until the OSD text is hidden. This is confusing, so
change it that the bar is updated. (Making the bar disappear on such
seeks would require much more changes, so we're lazy and go with this
commit.)
osd: add --no-osd-bar option to disable the OSD bar

In addition to disabling the OSD bar physically, also add some fallbacks
to OSD text in places the OSD bar would have been used.
command: give feedback on the OSD if a property is unavailable

Until now, setting a property that is not available (e.g. deinterlacing
if not using vdpau and no deinterlacing filter is inserted) silently
failed (except for a messager on the terminal). Instead show on the OSD
that the property is unavailable.
mplayer: use talloc instead of malloc for status line
osd: add --osd-status-msg option for custom OSD status
cleanup: remove duplicated function, move escape parsing function