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saugns v0.4.7. Improved named note frequencies.

Language changes:
 * Add generator type `A` (Amplitude generator), for
   sweepable amplitude offsets i.e. DC offsets, plus
   adding and/or multiplying its AM modulators.
 * Frequencies as notes.
   - Support MIDI note number constants (`M0` to `M127`
     where `M69` by default corresponds to 440 Hz). All
     tuning systems are supported, but for just intoned
     notes, numbers which don't map to any natural note
     get the average of the two surrounding ones. Other
     options include flats and sharps (which for a just
     note are never exactly between two notes) like for
     C-D-E-F-G-A-B notes.
   - For just intoned tuning modes, rotate scale ratios
     with key selection, so that the note for a key has
     the first ratio. Makes tuning good for non-C keys.

Generator `A` is yet of limited use, but will take a
greater role when distortion options etc. are added.