Add a new experiment of REF_ADAPT
Noticed that some ALTREF_FRAMEs could have used compound modes for its prediction but have been labeled as SINGLE_REFERENCE mode in the frame header. This experiment is to remove the COMPOUND_REFERENCE mode from the frame-level reference mode choices and only leave SINGLE_REFERENCE and REFERENCE_MODE_SELECT the two choices in the frame header. When turning on both ext-refs and ref-adapt, compared against ext-refs itself, a small gain is achieved. In PSNR, the bitrate saving gains are as follows: lowres: Avg -0.120%; BDRate -0.128% midres: Avg -0.155%; BDRate -0.128% Change-Id: I2cfff8a6b7eaa65ef863dbdbc4dd086d3b586f8c
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