OO-2179 deliver ical feed in copy/paste input box and not as link

src/main/java/org/olat/commons/calendar/ui/_content/calAggregatedFeed.html

 <h4>$r.translate("cal.icalfeed.aggregated.title")</h4>
 <div class="o_info">$r.translate("cal.icalfeed.aggregated.info")</div>
-<div class="clearfix"><a href="$icalFeedLink">$icalFeedLink</a></div>
+<div class="clearfix"><input type="text" value="$icalFeedLink" style="width:100%;" onclick="this.select();"/></div>
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src/main/java/org/olat/commons/calendar/ui/_content/calIcalFeed.html

 <h4>$r.translate("cal.icalfeed.title")</h4>
 <div class="o_info">$r.translate("cal.icalfeed.info")</div>
-<div class="clearfix"><a href="$icalFeedLink">$icalFeedLink</a></div>
+<div class="clearfix"><input type="text" value="$icalFeedLink" style="width:100%;" onclick="this.select();"/></div>
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