Switch to float audio

components/audio/include/ftl/audio/audio.hpp

components/audio/include/ftl/audio/buffer.hpp

components/audio/include/ftl/audio/decoder.hpp

components/audio/include/ftl/audio/encoder.hpp

components/audio/include/ftl/audio/software_decoder.hpp

components/audio/include/ftl/audio/software_encoder.hpp

components/audio/include/ftl/audio/source.hpp

components/audio/include/ftl/audio/speaker.hpp

components/audio/src/software_decoder.cpp

components/audio/src/software_encoder.cpp

components/audio/src/source.cpp

components/audio/src/speaker.cpp