CSS/monitoring: get rid of different formatting

First attempt to clean up the GUI, "same" elements looked different
in different places.

TODO: move more monitoriny-only CSS to the monitoring module
Monitoring\Controller: provide $this->backend

Every monitoring controller needs $backend, so why declaring it over
and over again. Created "moduleInit" dummy function in our base action
controller to allow such implementations without polluting init().
Web/ActionController: provide $this->params

We always need params, this are our new URL params made accessible
this way. This is just for our query string, not for POST body params.