Templates cleanup

Templates cleanup to make sure all pages benefit from the same functionality.
This changes touched Explore, Tags and Public tabs. as well as right hand panel Preview tab including viewing images in share.

To test just check if all tabs display data correct. To test center panel please add

```
$ bin/omero config append omero.web.ui.center_plugins '["Split View", "webclient/data/includes/center_plugin.splitview.js.html", "split_view_panel"]'
```

cc: @will-moore