Migrate to AndroidX (#2424)

* Migrate to AndroidX (automatic conversion by Android Studio)

* AndroidX dependency code updates

* Fix source preference reparenting

* fixes the androidx prefererences icon spacing issue

(cherry picked from commit b76a15d960ec2cdf771be16377db0348b66b3179)

* Fix source preference screen heading size/list padding

Co-authored-by: Carlos <cargo8005@gmail.com>

app/src/main/res/layout/navigation_view_text.xml

@@ -8,14 +8,14 @@
     android:background="?attr/selectableItemBackground"
     android:focusable="true">
 
-    <android.support.design.widget.TextInputLayout
+    <com.google.android.material.textfield.TextInputLayout
         android:id="@+id/nav_view_item_wrapper"
         android:layout_width="0dp"
         android:layout_height="match_parent"
         android:layout_weight="1"
         android:gravity="center_vertical|start">
 
-        <android.support.design.widget.TextInputEditText
+        <com.google.android.material.textfield.TextInputEditText
             android:id="@+id/nav_view_item"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
@@ -24,6 +24,6 @@
             android:imeOptions="actionDone"
             android:textAppearance="@style/TextAppearance.AppCompat.Body2" />
 
-    </android.support.design.widget.TextInputLayout>
+    </com.google.android.material.textfield.TextInputLayout>
 
 </LinearLayout>