Fix deinterlacing frame size and frame rate problems.

Replace ad-hoc ECVDeinterlacedVideoFormat definitions with -spatialResolution and -temporalResolution. ECVVideoFormat also gets -displaySizeWithAspectRatio:.

All deinterlacing modes double the display height (by definition), but some double the spatial resolution (pixel height) and some don't.

Likewise, most deinterlacers preserve the original frame rate, but at least one ("drop," so far) cuts the frame rate in half.