SubPicAP: Implement the "refreshRate" field.

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.
SubPicAP: Acquire the lock before changing the SubPicQueue.
SubPicAP: Refuse XySubFilter connection if there is already a provider connected.
FGManager: Block XySubFilter if the ISR is enabled.
FGManager: Offer subtitles on the filter graph.
SubPicAP: Return renderer name using typeid