Allow using custom tile server via HTTP (#3976)

app/src/main/AndroidManifest.xml

@@ -105,7 +105,8 @@
         android:supportsRtl="true"
         android:hardwareAccelerated="true"
         android:theme="@style/SplashTheme"
-        android:localeConfig="@xml/locales_config">
+        android:localeConfig="@xml/locales_config"
+        android:networkSecurityConfig="@xml/network_security_config">
 
         <!-- Default crash collection and analytics off until we (possibly) turn it on in application.onCreate -->
         <meta-data

app/src/main/res/xml/network_security_config.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<network-security-config>
+    <base-config cleartextTrafficPermitted="false">
+        <trust-anchors>
+            <certificates src="system"/>
+        </trust-anchors>
+    </base-config>
+
+    <domain-config cleartextTrafficPermitted="true">
+        <domain includeSubdomains="true">127.0.0.1</domain>
+        <domain includeSubdomains="true">localhost</domain>
+    </domain-config>
+</network-security-config>