Export "schedule" in some standard form for apps like giggity

[yarikoptic]

Relates to

• Integration with external bibliography reference(s) such as Zotero #32

but may be not needed if some integration with the "official" OHBM app is coming?

If not, it would be cool if there was a way figured out (through zotero or some other external store) to keep in sync with schedule in some standard (Pentabarf/frab/wafer/Pretalx/OSEM? copied from giggity) form , apps like https://github.com/Wilm0r/giggity could load up -- would be nice