VideoRenderers: Prevent subtitle queue from being destroyed on device reset.
XySubPicQueue: Implemented threaded subtitle rendering.
SubPicImpl: Don't deflate the dirty rectangle.

Fixes subtitles at the edge of the video frame missing a column of pixels, should be tested with HDMV (PGS) subs.
XySubPicProvider: Wait for frame delivery when requesting the frame instead of relying on subsequent calls to wait.
ISR: Vobsub/PGS/DVB subtitles are now rendered relative to the video frame.
XySubPicProvider: Support texture sizes smaller than the video rectangle.
XySubPicProvider: Always render subtitles relative to the video rectangle.
SubPicAP: Give the window rectangle if the video rectangle is not yet available.
SubPicAP: Implement the "refreshRate" field of the xy subtitle interface.

Requires the RefreshRate member of the video renderers to be moved up to the parent class.
XySubPicQueueNoThread: Allocate the SubPic after setting the texture resolution.