saugns v0.4.3. Add 'N' noise generator. Small redesign steps. Language changes: * Add generator type `N` (Noise generator), a plain noise generator without any frequency parameters. It has the underlying noise types of `R` and red. * Variable syntax. Relax rules for use of numerical variable `=`, allow whitespace after `=`, and not only before it. This behavior is less surprising. * Allow `[]` list unconnected to any parameter. Its objects are held unused. More language constructs are needed to use the free list, or its contents. * Amplitude handling. Add `S a.m`, script-wide gain mix control in outermost scope. Replaces the role of `S a` in disabling auto-downscaling by voices. Parser redesign: * Turn lists into a main type, for two with the old audio "operator". Create objects, do type checks. * Make parseconv a utility header the parser simply uses. Simplify memory handling & code structures. Fix some parser warnings wrongly numbering position.