Move some caldav calls into Calendar Model

[georgehrke]

Whats about moving some of the caldav calls into the Calendar model itself. The CalendarService would keep get, getAll and create. but: calendar.update() instead of CalendarService.update(calendar) calendar.delete() instead of CalendarService.delete(calendar) calendar.share(...) instead of CalendarService.share(calendar, ...) calendar.unshare(...) instead of CalendarService.unshare(calendar, ...)

[georgehrke]

@tcitworld @DeepDiver1975 your opinion?

[georgehrke]

also calendar.publish() and calendar.unpublish() for public sharing

[tcitworld]

I don't see why not except that the Calendar model is going to be quite huge. Also, only the Calendar model (and subscriptions at some point) would make use of the remaining methods inside CalendarService, so that doesn't changes much.