Adding timing info to sequence headers

aom/aomcx.h

aom_dsp/binary_codes_reader.c

aom_dsp/binary_codes_reader.h

aom_dsp/binary_codes_writer.c

aom_dsp/binary_codes_writer.h

aom_dsp/bitreader_buffer.c

aom_dsp/bitreader_buffer.h

aom_dsp/bitwriter_buffer.c

aom_dsp/bitwriter_buffer.h

aomenc.c

av1/av1_cx_iface.c

av1/av1_dx_iface.c

av1/common/onyxc_int.h

av1/decoder/decodeframe.c

av1/decoder/decodeframe.h

av1/decoder/obu.c

av1/encoder/bitstream.c

av1/encoder/encoder.c

av1/encoder/encoder.h

build/cmake/aom_config_defaults.cmake