Creating classes to accessing QGIS Map Layer and update lizmapProject

qgisMapLayer
qgisVectorLayer
lizmapProject::getLayer
lizmapProject::getLayerByKeyword
lizmapProject::getComposer
Add multi-printing
Little CSS changes
Debugging zoom level management
Project page - small ui modifications
Service - Allow Lizmap to act as WFS proxy (add DescribeFeatureType request)