LatLngs should be rounded to 6 significant figures when displayed

[growse]

Avoids ugly floating point recurring decimals nonsense.

Fixes #1278

[codecov[bot]]

Codecov Report

Base: 45.74% // Head: 46.00% // Increases project coverage by +0.25% :tada:

Coverage data is based on head (f41ce86) compared to base (f984043). Patch coverage: 66.66% of modified lines in pull request are covered.

:exclamation: Current head f41ce86 differs from pull request most recent head e3f4574. Consider uploading reports for the commit e3f4574 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1279      +/-   ##
============================================
+ Coverage     45.74%   46.00%   +0.25%     
+ Complexity     1017     1016       -1     
============================================
  Files           172      172              
  Lines          6728     6721       -7     
  Branches        686      687       +1     
============================================
+ Hits           3078     3092      +14     
+ Misses         3266     3247      -19     
+ Partials        384      382       -2     

Flag	Coverage Δ
uitests	41.03% <66.66%> (+0.26%)	:arrow_up:
unittests	14.18% <33.33%> (+0.02%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...org/owntracks/android/ui/map/osm/OSMMapFragment.kt	77.48% <50.00%> (+1.09%)	:arrow_up:
...wntracks/android/model/messages/MessageLocation.kt	91.52% <100.00%> (+0.14%)	:arrow_up:
...rg/owntracks/android/geocoding/GeocoderLRUCache.kt	62.50% <0.00%> (-25.00%)	:arrow_down:
...android/services/MessageProcessorEndpointHttp.java	61.93% <0.00%> (-3.23%)	:arrow_down:
.../owntracks/android/services/LocationProcessor.java	32.32% <0.00%> (-2.03%)	:arrow_down:
...g/owntracks/android/services/MessageProcessor.java	45.96% <0.00%> (-1.21%)	:arrow_down:
...n/java/org/owntracks/android/ui/map/MapActivity.kt	3.02% <0.00%> (ø)
...rg/owntracks/android/ui/welcome/VersionFragment.kt	0.00% <0.00%> (ø)
...acks/android/ui/welcome/ConnectionSetupFragment.kt	0.00% <0.00%> (ø)
...n/java/org/owntracks/android/ui/map/MapFragment.kt	81.39% <0.00%> (+1.39%)	:arrow_up:
... and 5 more

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