MainFrm: fix graph closing

When called from OnOpenMediaFailed() and with the graph thread disabled
we tried to wait for graph thread synchronization event.
MainFrm: delay setting video output rect

Should fix all remaining visual glitches that appear while opening new
videos
MainFrm: fix auto-zoom for negative working areas

For example on displays positioned on the left side of the main one,
mpc-hc window tended to crawl to the right.
MainFrm: initialize status time immediately
MainFrm: respect minimum allowed sizes of panels
Include auto-hidden toolbars in OnGetMinMaxInfo()
Don't use IMadVRSubclassReplacement

This interface is not supposed to be used like that.
Thus, to provide mouse messages to madVR, go back to using
CMainFrame::WindowProc()
Hide the seekbar in capture mode since it can never be used.
MainFrm: fix rare black screen issue with madvr

Or more like hack around for now, it needs to be be discussed
with the author of madvr