message: Make history entries standalone tags
diff: <param name="availableHDs" type="Integer" minvalue="1" maxvalue="7" mandatory="false" since="5.0">
  <description>number of HD sub-channels if available</description>
  <history>
  - <param name="availableHDs" type="Integer" minvalue="1" maxvalue="3" mandatory="false" since="4.5" until="5.0"></param>
  + <param name="availableHDs" type="Integer" minvalue="1" maxvalue="3" mandatory="false" since="4.5" until="5.0"/>
  </history>
  </param>
  <param name="hdChannel" type="Integer" minvalue="1" maxvalue="7" mandatory="false" since="5.0">
  <description>Current HD sub-channel if available</description>
  <history>
  - <param name="hdChannel" type="Integer" minvalue="1" maxvalue="3" mandatory="false" since="4.5" until="5.0"> </param>
  + <param name="hdChannel" type="Integer" minvalue="1" maxvalue="3" mandatory="false" since="4.5" until="5.0"/>
  </history>
  </param>
  <param name="signalStrength" type="Integer" minvalue="0" maxvalue="100" mandatory="false">
  