Dev css

This PR add ga-XXX-xxx prefix to all the css classes generated by our components,
and use attribute filter css.

Needs testers:

http://mf-geoadmin3.dev.bgdi.ch/dev_css/prod/?lang=fr&topic=ech&bgLayer=ch.swisstopo.pixelkarte-farbe&X=141464.00&Y=509482.50&zoom=2&swipe_ratio=0.50&catalogNodes=457,477&layers=ch.bafu.biogeographische_regionen&layers_opacity=0.75