spectral and waveshape views in the waveform editor

- edit patterns and composite waveform after they have been created.
- library of composite waveforms examples has been added.
- rendering of glissandi sounds is made more faithful to what is actually heard.
- edition of waveshape waveforms and envelopes has been improved, allowing very precise tunings.

Make As Waveform function: turn a set of sound into a waveform

New library including far more waveforms, envelopes and examples of FM, granular and additive synthesis.

versions 2.0 to 2.05 had a major redraw bug on MacOS X 10.5 Leopard that limited usability. Version 2.06 works around this (Apple) bug.

Mostly bug fixes

Among many new features, it includes a revolutionary new method to express modulation, unifying the concepts of FM synthesis, ring modulation, low frequency tremolo and vibrato.

v2.0 also extends the notion of patterns, which is a simple way to group sounds and instantiate those groups to create rhythms, accompanying sequences, granular synthesis and much more.

Documentation has been extended and more examples are provided.

Finally, note that while HighC stays free for entertainment and educational purposes, access to its professional features now requires a purchasing a license (29.99 euros).

minor update to fulfill usability requests