Fix incorrect property tags for TimeZonePropertyDefinition (StartTimeZone, EndTimeZone, etc)

[tobiasviehweger]

Hi,

just noticed an error, that prevents updating timezones on appointments. This is due to the fact that the XML is generated incorrect, before it was like this:

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
	<soap:Header>
		<t:RequestServerVersion Version="Exchange2013"/>
	</soap:Header>
	<soap:Body>
		<m:CreateItem SendMeetingInvitations="SendToNone">
			<m:SavedItemFolderId>
				<t:DistinguishedFolderId Id="calendar">
					<t:Mailbox>
						<t:EmailAddress>email</t:EmailAddress>
					</t:Mailbox>
				</t:DistinguishedFolderId>
			</m:SavedItemFolderId>
			<m:Items>
				<t:CalendarItem>
					<t:Subject>Vorlesung Once</t:Subject>
					<t:Start>2017-12-14T13:00:00.000+00:00</t:Start>
					<t:End>2017-12-14T14:00:00.000+00:00</t:End>
					<t:IsAllDayEvent>false</t:IsAllDayEvent>
					<t:TimeZoneDefinition Name="(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna" Id="W. Europe Standard Time"/>
					<t:TimeZoneDefinition Name="(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna" Id="W. Europe Standard Time"/>
				</t:CalendarItem>
			</m:Items>
		</m:CreateItem>
	</soap:Body>
</soap:Envelope>

As you can see, the start and end timezone properties are wrong (though ignored by EWS). Corrected version uses the provided xmlElementName and looks like:

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
	<soap:Header>
		<t:RequestServerVersion Version="Exchange2013"/>
	</soap:Header>
	<soap:Body>
		<m:CreateItem SendMeetingInvitations="SendToNone">
			<m:SavedItemFolderId>
				<t:DistinguishedFolderId Id="calendar">
					<t:Mailbox>
						<t:EmailAddress>email</t:EmailAddress>
					</t:Mailbox>
				</t:DistinguishedFolderId>
			</m:SavedItemFolderId>
			<m:Items>
				<t:CalendarItem>
					<t:Subject>Vorlesung Once</t:Subject>
					<t:Start>2017-12-14T13:00:00.000+00:00</t:Start>
					<t:End>2017-12-14T14:00:00.000+00:00</t:End>
					<t:IsAllDayEvent>false</t:IsAllDayEvent>
					<t:StartTimeZone Name="(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna" Id="W. Europe Standard Time"/>
					<t:EndTimeZone Name="(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna" Id="W. Europe Standard Time"/>
				</t:CalendarItem>
			</m:Items>
		</m:CreateItem>
	</soap:Body>
</soap:Envelope>