[NEW] Adaptive Icons (#1904)

* Remove unnecessary stuff from debug build

* Adaptive icon for experimental app

android/app/src/debug/res/values/colors.xml

-<?xml version="1.0" encoding="utf-8"?> <resources> <color name="primary_dark">#660B0B0B</color> </resources>
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android/app/src/debug/res/values/strings.xml

 <resources>
-    <string name="app_name">[DEVELOP] RocketChatRN</string>
-
-    <string name="no_browser_found">No Browser Found</string>
+    <string name="app_name">[DEBUG] Rocket.Chat Experimental</string>
+    <string name="share_extension_name">[DEBUG] Rocket.Chat Experimental</string>
 </resources>

android/app/src/debug/res/values/styles.xml

-<resources>
-
-    <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
-        <!-- Customize your theme here. -->
-        <item name="android:colorEdgeEffect">#aaaaaa</item>
-    </style>
-
-</resources>

android/app/src/main/res/drawable-v24/ic_launcher_background.xml

+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="512"
+    android:viewportHeight="512">
+  <path
+      android:pathData="M0,0h512v512h-512z">
+    <aapt:attr name="android:fillColor">
+      <gradient 
+          android:startY="0"
+          android:startX="256"
+          android:endY="512"
+          android:endX="256"
+          android:type="linear">
+        <item android:offset="0" android:color="#FF1C82FF"/>
+        <item android:offset="1" android:color="#FF0066E3"/>
+      </gradient>
+    </aapt:attr>
+  </path>
+</vector>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>
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android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>
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