Ernst create point template and controller

Part of RFC #36, following #38. Comes with: https://github.com/nens/lizard-nxt/pull/227

### Situation
ActivePoint combines all data of a click on the map.

### Problem
This object is reset after every click and should be rendered by a seperate template. Therefore the code should be migrated to a seperate controller that is attached to the template

TODO:
- [x] Create activePoint template
- [x] Set box type to activePoint on click on map
- [x] Create activePoint controller
- [x] Migrate relavant markup that lives in the other templates to activePoint template
where is the rain overlay map being removed again?