FuncChain: added methods for anonymous adding and removing

so FuncChain can just be used like a FunctionList now,
and access/removal/insertion by names  (addAfter, etc)
is optional.
minor bug fix in MIDIExplorer, added definition file for spec.scd files
Converted spec files for MIDI devices to new format.
Moved spec files for HID devices to oldHID folder (as they have to be revised more thoroughly).
moved _HowToMakeAKtlDescription_.scd to SketchesNotesEtc.
converted markdown file for spec definitions to schelp.
added howto for description file generating. Lacks sections for HID and OSC.
convert to MIDIFunc
fixed MIDIExplorer:stop and made it conform to spec definition
minor typo in MKtl_description_files
Merge branch 'origin/tillBergen'
Merge branch 'origin/adc_bergen13'