small map changes

[sgratzl]

Prerequisites:

• Unless it is a hotfix it should be merged against the dev branch
• Branch is up-to-date with the branch to be merged with, i.e. dev
• Build is successful
• Code is cleaned up and formatted

Summary

various changes related to the map

• set a min/maximum zoom level
• change automatic focus on region logic: only when the user uses the search bar it will focus on the selected region, in all other cases the zoom level of the map won't change automatically anymore.

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[tildechris]

LGTM. I didn't notice a big difference in how far you could zoom out, but the level to which you can zoom in looks like an improvement. I also like the automatic focus changes.

[Raphael-Hyde]

LGTM for the zoom-in limit

Also, not seeing the zoom-out limit, thank for sharing @sgratzl