Sync "com.schriftgestaltung" lib keys between Glyphs and glyphsLib

There are several lib keys that are different between .ufo written by Glyphs and glyphsLib. It would be favorable to sync them.

some examples:
| Glyphs | glyphsLib |
|----------------|----------------|
| com.schriftgestaltung.DisplayStrings | com.schriftgestaltung.customParameter.GSFont.DisplayStrings |
| com.schriftgestaltung.disablesAutomaticAlignment | com.schriftgestaltung.customParameter.GSFont.disablesAutomaticAlignment |

I’ll send a pull request.

Start by comparing the lib keys written by Glyphs and glyphsLib in the .ufo examples given in the issue. Identify the remaining com.schriftgestaltung differences and make the two representations consistent; completion means the listed keys and other affected keys are synchronized.

Written by the indexing model from the issue text.