MKCALENDAR does not send valid calendar-timezone

[ArnyminerZ]

Purpose

See #1246.

Short description

Added ProdId and Version to the generated VCALENDAR.

Test request:

<?xml version='1.0' encoding='UTF-8' ?>
<CAL:mkcalendar
	xmlns="DAV:"
	xmlns:CAL="urn:ietf:params:xml:ns:caldav"
	xmlns:CARD="urn:ietf:params:xml:ns:carddav">
	<set>
		<prop>
			<resourcetype>
				<collection />
				<CAL:calendar />
			</resourcetype>
			<displayname>At Cairo</displayname>
			<CAL:calendar-description></CAL:calendar-description>
			<n0:calendar-color
				xmlns:n0="http://apple.com/ns/ical/">#0000CDFF
			</n0:calendar-color>
			<CAL:calendar-timezone-id>Africa/Cairo</CAL:calendar-timezone-id>
			<CAL:calendar-timezone>BEGIN:VCALENDAR
                 PRODID:+//IDN bitfire.at//ical4android
                 VERSION:2.0
                 BEGIN:VTIMEZONE
                 TZID:Africa/Cairo
                 LAST-MODIFIED:20240422T053450Z
                 TZURL:https://www.tzurl.org/zoneinfo/Africa/Cairo
                 X-LIC-LOCATION:Africa/Cairo
                 X-PROLEPTIC-TZNAME:LMT
                 BEGIN:STANDARD
                 TZNAME:EET
                 TZOFFSETFROM:+020509
                 TZOFFSETTO:+0200
                 DTSTART:19001001T011444
                 END:STANDARD
                 BEGIN:DAYLIGHT
                 TZNAME:EEST
                 TZOFFSETFROM:+0200
                 TZOFFSETTO:+0300
                 DTSTART:19400715T000000
                 RDATE:19410415T000000
                 RDATE:19450416T000000
                 RDATE:19570510T000000
                 RDATE:19580501T000000
                 RDATE:19820725T010000
                 RDATE:19830712T010000
                 RDATE:19890506T010000
                 RDATE:20100910T000000
                 RDATE:20140516T000000
                 RDATE:20140801T000000
                 END:DAYLIGHT
                 BEGIN:STANDARD
                 TZNAME:EET
                 TZOFFSETFROM:+0300
                 TZOFFSETTO:+0200
                 DTSTART:19401001T000000
                 RDATE:19410916T000000
                 RDATE:19421027T000000
                 RDATE:20060922T000000
                 RDATE:20070907T000000
                 RDATE:20080829T000000
                 RDATE:20090821T000000
                 RDATE:20100811T000000
                 RDATE:20101001T000000
                 RDATE:20140627T000000
                 RDATE:20140926T000000
                 END:STANDARD
                 BEGIN:DAYLIGHT
                 TZNAME:EEST
                 TZOFFSETFROM:+0200
                 TZOFFSETTO:+0300
                 DTSTART:19420401T000000
                 RRULE:FREQ=YEARLY;UNTIL=19440331T220000Z
                 END:DAYLIGHT
                 BEGIN:STANDARD
                 TZNAME:EET
                 TZOFFSETFROM:+0300
                 TZOFFSETTO:+0200
                 DTSTART:19431101T000000
                 RRULE:FREQ=YEARLY;UNTIL=19451031T210000Z
                 END:STANDARD
                 BEGIN:STANDARD
                 TZNAME:EET
                 TZOFFSETFROM:+0300
                 TZOFFSETTO:+0200
                 DTSTART:19571001T000000
                 RRULE:FREQ=YEARLY;UNTIL=19580930T210000Z
                 END:STANDARD
                 BEGIN:DAYLIGHT
                 TZNAME:EEST
                 TZOFFSETFROM:+0200
                 TZOFFSETTO:+0300
                 DTSTART:19590501T010000
                 RRULE:FREQ=YEARLY;UNTIL=19810430T230000Z
                 END:DAYLIGHT
                 BEGIN:STANDARD
                 TZNAME:EET
                 TZOFFSETFROM:+0300
                 TZOFFSETTO:+0200
                 DTSTART:19590930T030000
                 RRULE:FREQ=YEARLY;UNTIL=19650930T000000Z
                 END:STANDARD
                 BEGIN:STANDARD
                 TZNAME:EET
                 TZOFFSETFROM:+0300
                 TZOFFSETTO:+0200
                 DTSTART:19661001T030000
                 RRULE:FREQ=YEARLY;UNTIL=19941001T000000Z
                 END:STANDARD
                 BEGIN:DAYLIGHT
                 TZNAME:EEST
                 TZOFFSETFROM:+0200
                 TZOFFSETTO:+0300
                 DTSTART:19840501T010000
                 RRULE:FREQ=YEARLY;UNTIL=19880430T230000Z
                 END:DAYLIGHT
                 BEGIN:DAYLIGHT
                 TZNAME:EEST
                 TZOFFSETFROM:+0200
                 TZOFFSETTO:+0300
                 DTSTART:19900501T010000
                 RRULE:FREQ=YEARLY;UNTIL=19940430T230000Z
                 END:DAYLIGHT
                 BEGIN:DAYLIGHT
                 TZNAME:EEST
                 TZOFFSETFROM:+0200
                 TZOFFSETTO:+0300
                 DTSTART:19950428T000000
                 RRULE:FREQ=YEARLY;UNTIL=20100429T220000Z;BYMONTH=4;BYDAY=-1FR
                 END:DAYLIGHT
                 BEGIN:STANDARD
                 TZNAME:EET
                 TZOFFSETFROM:+0300
                 TZOFFSETTO:+0200
                 DTSTART:19950929T000000
                 RRULE:FREQ=YEARLY;UNTIL=20050929T210000Z;BYYEARDAY=-92,-93,-94,-95,-96,-97,-98;BYDAY=FR
                 END:STANDARD
                 BEGIN:DAYLIGHT
                 TZNAME:EEST
                 TZOFFSETFROM:+0200
                 TZOFFSETTO:+0300
                 DTSTART:20230428T000000
                 RRULE:FREQ=YEARLY;BYMONTH=4;BYDAY=-1FR
                 END:DAYLIGHT
                 BEGIN:STANDARD
                 TZNAME:EET
                 TZOFFSETFROM:+0300
                 TZOFFSETTO:+0200
                 DTSTART:20231027T000000
                 RRULE:FREQ=YEARLY;BYYEARDAY=-61,-62,-63,-64,-65,-66,-67;BYDAY=FR
                 END:STANDARD
                 END:VTIMEZONE
                 END:VCALENDAR
                 </CAL:calendar-timezone>
		</prop>
	</set>
</CAL:mkcalendar>

Checklist

• The PR has a proper title, description and label.
• I have self-reviewed the PR.
• I have added documentation to complex functions and functions that can be used by other modules.
• I have added reasonable tests or consciously decided to not add tests.