Added better frame synchronisation

include/rew/common/output.h

include/rew/common/packet.h

include/rew/config.h

include/rew/decoder/byte_assembler.h

include/rew/decoder/decoder.h

include/rew/decoder/frame_sync.h

include/rew/decoder/packet_assembler.h

include/rew/encoder/samples_generator.h

samples_to_graph.py

src/rew/decoder/byte_assembler.cpp

src/rew/decoder/decoder.cpp

src/rew/decoder/file_assembler.cpp

src/rew/decoder/frame_sync.cpp

src/rew/decoder/packet_assembler.cpp

src/rew/encoder/audio_sink.cpp

src/rew/encoder/packet_generator.cpp

src/rew/encoder/samples_generator.cpp

src/rew/encoder/tone_synth.cpp

tests/decode.cpp