Merge of features from QGIS Webclient of Kanton Glarus (http://map.geo.gl.ch)

- added QGIS.LayerOrderPanel for reordering layers and setting layer transparency
- added expandable legend to layer tree nodes
- removed legend and metadata tabs
- added optional project title lookup
- added optional header logo with link
- added optional terms of use link to header
- added opening of hyperlinks from attributes with URLs in feature info result
- added config option to hide geometry column in feature info result