vdr-addon: remove epgdata.com setup options as they are useless
vdr-addon: cleanup epgsources handling
 - use epgsources from ADDON_HOME
 - copy template epgsources to ADDON_HOME
 - support for multiple epgsources
 - support user defined epgsources
vdr-addon: add default ENABLE_XMLTV2VDR setup option
vdr-addon: update changelog