Merge branch 'release-1.7.0.0' into develop
Prepares loading indicator.
Adds loading-indicator icons.
Displays indicators, when reloading data.
Shows indicators only for active layers.

As data for deselected providers is not fetched, we should not
present an indicator, either.
Puts ads to the top to prevent accidential clicks.
Makes indicators work only some providers/subsets selected.
Flips indicators instead of spinning.
Bumps version number and adds log-entry
Merge branch 'release-1.7.0.1'