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/main_activity.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v4.widget.DrawerLayout
+<androidx.drawerlayout.widget.DrawerLayout
     android:id="@+id/drawer"
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
@@ -18,7 +18,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content">
 
-            <android.support.v7.widget.Toolbar
+            <androidx.appcompat.widget.Toolbar
                 android:id="@+id/toolbar"
                 xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="match_parent"
@@ -26,7 +26,7 @@
                 android:background="?attr/colorPrimary"
                 android:theme="?attr/actionBarTheme"/>
 
-            <android.support.design.widget.TabLayout
+            <com.google.android.material.tabs.TabLayout
                 android:id="@+id/tabs"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
@@ -45,7 +45,7 @@
 
     </LinearLayout>
 
-    <android.support.design.widget.NavigationView
+    <com.google.android.material.navigation.NavigationView
         android:id="@+id/nav_view"
         android:layout_width="wrap_content"
         android:layout_height="match_parent"
@@ -55,4 +55,4 @@
         app:headerLayout="@layout/navigation_header"
         app:menu="@menu/menu_navigation"/>
 
-</android.support.v4.widget.DrawerLayout>
+</androidx.drawerlayout.widget.DrawerLayout>