Search this area (#2051)

* Recognize user is moving on the map and show a button

* Use variable from strings xml instead of hardcoded string

* Change search this area button location in xml file

* Add location util file to convert mapbox LatLng to commons Latlng and viceversa

* Populate places around searched area

* Update narby map according to new points came from searched area

* Add searchThisAreaMode boolean to stop nearby map updated when we try to search nearby areas.

* Lock auto nearby operations during serch this area mode, with a more modular method and decrease code repetition

* Add an if clausse to prevent multiple refresh view calls, while map is moving

* Disable map gestures during search this area operation, re-eable them on operation is done

* Add progress bar during search this area operation

* Make sure you locked the map during search nearby map process

* Implement recenter map view button

* Fix logic problem and make sure you refreshed the view on coming back to previous position

* Use custom refresh method instead

* Use latest updated location from location manager isntead

* Update ListFragment accordingly too

* Do not update camera target according to bottom sheet status or do not follow users location with camera, if search this area mode is on

* Add javadocs, sorry forgotten previously

* Remove unused method

* Threat both or search this area and regular search in same way

* Make sure distances are correct

* Seperate cutom location updates and current location updates from each other to continue other operations

* Remove all logs, and make sure search this are button is not visible for no reason while around of current location is already loaded

* Notify load attractions from location method about search status, current location of custom location

* Make sure we calculate searched area and display search this area button when we are out of 3/4 of total searched area

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsFragment.java

@@ -622,7 +622,7 @@ public class ContributionsFragment
         curLatLng = locationManager.getLastLocation();
 
         placesDisposable = Observable.fromCallable(() -> nearbyController
-                .loadAttractionsFromLocation(curLatLng, true)) // thanks to boolean, it will only return closest result
+                .loadAttractionsFromLocation(curLatLng, curLatLng, true, false)) // thanks to boolean, it will only return closest result
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(this::updateNearbyNotification,