profile: port event unhiding to QtQuick

This has UI changes:
- The unhiding options are accessed by a field that appears when
  there are hidden events.
- Only event-types of this particular dive are unhidden.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

profile-widget/divetextitem.cpp

@@ -90,6 +90,11 @@ double DiveTextItem::fontHeight(double dpr, double scale)
 	return (double)fm.height();
 }
 
+double DiveTextItem::width() const
+{
+	return boundingRect().width();
+}
+
 double DiveTextItem::height() const
 {
 	return fontHeight(dpr, scale) + outlineSize * dpr;