v0.0.6

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Added

• song_demo, demonstrates playback of a Song
• Engine class, handles playback for Songs and sound effects
• FrequencyControl, frequency effect logic for channels 1, 2 and 3
• Note lookup table for channel 4, NOTE_NOISE_TABLE
• MusicRuntime, handles song playback (replaces SongRuntime + PatternRutime + TrackRuntime)
• NoteControl, handles note triggers and cuts with an optional delay.
• PatternCursor, utility class for random access/iteration of a Pattern
• RuntimeContext struct, utility struct containing Synth and Table references
• Timer class, used for tempo/speed

Changed

• Fixed warnings for ubuntu build
• Mixer no longer uses sigma approximation when calculating the STEP_TABLE, this was done as an experiment and also worked as a low pass filter. Filtering will be done elsewhere in the future.
• added utility method Synth::setFrequency
• added several new effects. Effects are now categorized by pattern, track and frequency.

Removed

• InstrumentRuntime, TrackRuntime, PatternRuntime and SongRuntime classes. These are being replaced with the newly added classes in the engine folder.
• Q53.hpp, replaced by Speed.hpp