osc: add feature to bottombar to not cover the video

Normally I use the OSC like this: not at all, but have a key binding
that does "cycle osc" to show it. And in that case, I don't really want
it to overlap the damn video.

I could use the zoom/pan options to move the video out of the way, but
this is also sort of annoying. Likewise, you could write a script or so
which does this automatically if the OSC appears, but that's still
annoying, and computing values for these options such that the video is
moved correctly is tricky.

So I added a bunch of options that set explicit video borders (previous
commit), and a option for the OSC to use them (this commit).

Disabled by default, since I'm afraid this is too awkward and
unpolished, especially with OSC default settings.

I'm also using "osc-visibility=always". Effectively, making the OSC
appear will box the video, and making it disappear (by unloading
osc.lua) will restore the video back to normal.

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