Add the syntax/decoder support for fwd-kf
Forward-coded KEY_FRAME, served as a backward reference frame, is coded as intra-only. The show_existing_frame to show the buffered forward KEY_FRAME needs to reset the frame context as well as reset the reference frame buffer. One binary symbol, namely reset_decoder_state, is added to the frame header. Whenever a frame is a show_existing_frame, it reads out this binary symbol value from the bitstream. When this binary symbol is 1, it indicates that the existing frame to show shall be an intra coded frame and will serve as a KEY_FRAME. The frame context is set to default and the reference buffer is updated the same way as a normal KEY_FRAME. Change-Id: I8b641220689459a104d2f5a03bbdb6820af8f990
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