Made Nearby Pins More Visible (commons-app#5440)

* NearbyParentFragment : added referer

In file NearbyParentFragment.java, I added header property, i.e., the referer - http://maps.wikimedia.org/
and set tile source to wikimedia.

* Reworded comments

* sdkmanager: added installation command for build-tools-30.0.3

* Revert "sdkmanager: added installation command for build-tools-30.0.3"

This reverts commit b3e5019.

* Update android.yml

* Update gradle.properties

* android.yml: removed extra debug commands

Removed some debug commands because they are no longer needed.

* ic_custom_map_marker: changed fill color to make it more visible.

Changed fill color for map marker used for nearby places that needs photo.

---------

Co-authored-by: Nicolas Raoul <nicolas.raoul@gmail.com>

Author: rohit9625

app/src/main/res/drawable/ic_custom_map_marker.xml

@@ -15,7 +15,7 @@
         android:strokeWidth="1" />
     <path
         android:fillAlpha="1"
-        android:fillColor="#006699"
+        android:fillColor="#2CB7A9"
         android:pathData="M11.617,21.707C10.518,20.424 9.338,18.864 8.395,17.449 6.524,14.641 5.455,12.305 5.102,10.255 5.014,9.744 5.006,8.628 5.088,8.137 5.348,6.561 6.043,5.221 7.158,4.148 9.148,2.231 12.016,1.668 14.593,2.688c2.043,0.809 3.607,2.581 4.162,4.719 0.174,0.67 0.204,0.933 0.203,1.761 -0.001,0.81 -0.035,1.098 -0.22,1.857 -0.614,2.524 -2.571,5.977 -5.383,9.501 -0.645,0.809 -1.321,1.61 -1.358,1.61 -0.008,0 -0.179,-0.193 -0.381,-0.428zM12.617,11.603c0.783,-0.188 1.457,-0.795 1.738,-1.564 0.516,-1.415 -0.317,-2.962 -1.783,-3.312 -0.216,-0.052 -0.317,-0.059 -0.661,-0.047 -0.354,0.012 -0.441,0.025 -0.682,0.104 -0.673,0.221 -1.205,0.695 -1.506,1.344 -0.176,0.38 -0.218,0.584 -0.217,1.054 0.001,0.324 0.014,0.452 0.064,0.635 0.266,0.97 1.077,1.689 2.079,1.844 0.243,0.038 0.68,0.012 0.968,-0.057z"
         android:strokeAlpha="1"
         android:strokeColor="#003b59"