test: Add sync tests
The async source sync test verifies that async sources are playing back in sync properly, and the "sync pair (video)" and "sync pair (audio)" sources test the back-end syncing down to the exact sample via inserting audio data directly in to the back-end with system timestamps. For these sources, when the video is white, a C sinewave should be playing, and when the video is black audio is mute.
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test/test-input/sync-pair-aud.c
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test/test-input/sync-pair-vid.c
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