(issue1753) Fix editing the point color (not Color) of SQThemes. Theme handling was already done case insensitive for some things but not for all. This is better as it makes the theme documents more robust and there is no ambiguity in the supported keywords.

<?xml version="1.0" encoding="UTF-8"?>
<wms-services>
  <wms name="OSM Hintergrundkarte" url="http://osm.intevation.de/bfg/service?"/>
  <wms name="Pegelonline" url="http://www.pegelonline.wsv.de/webservices/gis/wms/aktuell?"/>
</wms-services>