Extended Selector.make_autoeditable_class_selector().

Example:

    Blue Example Score (2013) - materials - sargasso measures

      Select autoeditable class:

       1: Accordion                      40: NoteAndChordHairpinHandler
       2: AltoFlute                      41: NoteAndChordHairpinsHandler
       3: AltoSaxophone                  42: NoteRhythmMaker
       4: AltoTrombone                   43: Oboe
       5: AltoVoice                      44: OctaveTranspositionMapping
       6: BaritoneSaxophone              45: OctaveTranspositionMappingComponent
       7: BaritoneVoice                  46: OctaveTranspositionMappingInventory
       8: BassClarinet                   47: PatternedArticulationsHandler
       9: BassFlute                      48: Performer
      10: BassSaxophone                  49: PerformerInventory
      11: BassTrombone                   50: Piano
      12: BassVoice                      51: Piccolo
      13: Bassoon                        52: PitchRange
      14: BeamSpecifier                  53: PitchRangeInventory
      15: BurnishSpecifier               54: ReiteratedArticulationHandler
      16: Cello                          55: ReiteratedDynamicHandler
      17: ClarinetInA                    56: RestRhythmMaker
      18: ClarinetInBFlat                57: SopraninoSaxophone
      19: ClarinetInEFlat                58: SopranoSaxophone
      20: Clef                           59: SopranoVoice
      21: ClefInventory                  60: Talea
      22: Contrabass                     61: TaleaRhythmMaker
      23: ContrabassClarinet             62: Tempo
      24: ContrabassFlute                63: TempoInventory
      25: ContrabassSaxophone            64: TenorSaxophone
      26: Contrabassoon                  65: TenorTrombone
      27: DurationSpellingSpecifier      66: TenorVoice
      28: EnglishHorn                    67: TerracedDynamicsHandler
      29: Flute                          68: TieSpecifier
      30: FrenchHorn                     69: TimeSignatureInventory
      31: Glockenspiel                   70: Trumpet
      32: Guitar                         71: Tuba
      33: Harp                           72: UntunedPercussion
      34: Harpsichord                    73: Vibraphone
      35: Instrument                     74: Viola
      36: Marimba                        75: Violin
      37: Markup                         76: Xylophone
      38: MarkupInventory                77: list
      39: MezzoSopranoVoice

    >

The realization here is that any class that implements an _attribute_manifest
property is autoeditable.

MODEL: we have an "autoedit protocol".