Add a marker and circle of accuracy for current location

[tobias47n9e]

Currently the user's position is not visible on the map. This
commit adds a marker to the user's position and a circular
polygon which shows the accuracy of the location measurement.

[codecov-io]

Codecov Report

Merging #692 into master will decrease coverage by 0.09%.
The diff coverage is 16.32%.

@@           Coverage Diff           @@
##           master   #692     +/-   ##
=======================================
- Coverage     6.1%     6%   -0.1%     
=======================================
  Files          88     94      +6     
  Lines        4885   5012    +127     
  Branches      439    444      +5     
=======================================
+ Hits          298    301      +3     
- Misses       4562   4686    +124     
  Partials       25     25

Impacted Files	Coverage Δ
.../fr/free/nrw/commons/nearby/NearbyMapFragment.java	0% <0%> (ø)	⬆️
...e/nrw/commons/location/LocationServiceManager.java	37.14% <0%> (-3.49%)	⬇️
...a/fr/free/nrw/commons/nearby/NearbyInfoDialog.java	0% <0%> (ø)	⬆️
.../java/fr/free/nrw/commons/nearby/NearbyPlaces.java	0% <0%> (ø)	⬆️
...a/fr/free/nrw/commons/nearby/NearbyController.java	19.56% <0%> (-0.89%)	⬇️
...n/java/fr/free/nrw/commons/MediaDataExtractor.java	0% <0%> (ø)	⬆️
...fr/free/nrw/commons/nearby/NearbyListFragment.java	75.67% <0%> (ø)	⬆️
...in/java/fr/free/nrw/commons/utils/LengthUtils.java	84.21% <100%> (ø)	⬆️
...main/java/fr/free/nrw/commons/location/LatLng.java	54.28% <80%> (+2.67%)	⬆️
...w/commons/contributions/ContributionsActivity.java	0% <0%> (ø)	⬆️
... and 6 more

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