Extract SelectionController from BaseGrid
Remove pointless wxSafeYield in FrameMain's constructor

This was needed to make the splash screen appear, and was missed when
the splash screen was killed.
Fix moving the top line of the file down
Eliminate all uses of FrameMain via the global app object
Delay showing the font caching dialog until subtitles are actually rendered
Pull some of the context (de)init out of FrameMain

And actually do deinitialize more of the stuff in the context.
Kill VideoContext::Get()
Delete in-repo copy of intttypes.h since vs2013 has it
Fix crash on empty progress title on OS X
Update ffms2