Add timezone property to newly created calendars

[tcitworld]

Closes #223

I didn't add the property on WebCal collections, not sure if applicable, but it's fairly easy to add it too.

Also, I didn't consider the case when someone updates his calendar but the timezone changed since the creation.

[georgehrke]

calendar-timezone is supposed to contain the actual VTimezone definition.

Stale

[tcitworld]

Not sure if CDATA element is to be used or not (SabreDAV tests has some, but it seems to be badly escaped on PROPFIND response).

I've yet to find a CalDAV client that supports this to test it, can you try this on MacOS/iOS ?

[georgehrke]

Yes, will do.
Will also check in Charles whether or not macOS uses CDATA when setting the timezone.

[tcitworld]

• Change failing test
• Get timezone from settings instead of detecting it

[georgehrke]

No CDATA:

<A:propertyupdate xmlns:A="DAV:">
	<A:set>
		<A:prop>
			<B:calendar-timezone xmlns:B="urn:ietf:params:xml:ns:caldav">BEGIN:VCALENDAR&#13;
				VERSION:2.0&#13;
				PRODID:-//Apple Inc.//Mac OS X 10.13.6//EN&#13;
				CALSCALE:GREGORIAN&#13;
				BEGIN:VTIMEZONE&#13;
				TZID:Europe/Berlin&#13;
				BEGIN:DAYLIGHT&#13;
				TZOFFSETFROM:+0100&#13;
				RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU&#13;
				DTSTART:19810329T020000&#13;
				TZNAME:CEST&#13;
				TZOFFSETTO:+0200&#13;
				END:DAYLIGHT&#13;
				BEGIN:STANDARD&#13;
				TZOFFSETFROM:+0200&#13;
				RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU&#13;
				DTSTART:19961027T030000&#13;
				TZNAME:CET&#13;
				TZOFFSETTO:+0100&#13;
				END:STANDARD&#13;
				END:VTIMEZONE&#13;
				END:VCALENDAR&#13;</B:calendar-timezone>
		</A:prop>
	</A:set>
</A:propertyupdate>

[georgehrke]

Closing in favour of #223 (comment)
Needs to be redone in Vue