add a settings toggle for autorotating the screen

app/src/main/kotlin/com/simplemobiletools/gallery/activities/SettingsActivity.kt

@@ -34,6 +34,7 @@ class SettingsActivity : SimpleActivity() {
         setupAnimateGifs()
         setupMaxBrightness()
         setupCropThumbnails()
+        setupAutoRotateScreen()
         setupShowMedia()
         updateTextColors(settings_holder)
     }
@@ -104,6 +105,14 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupAutoRotateScreen() {
+        settings_auto_rotate_screen.isChecked = config.autoRotateScreen
+        settings_auto_rotate_screen_holder.setOnClickListener {
+            settings_auto_rotate_screen.toggle()
+            config.autoRotateScreen = settings_auto_rotate_screen.isChecked
+        }
+    }
+
     private fun setupShowMedia() {
         settings_show_media.text = getShowMediaText()
         settings_show_media_holder.setOnClickListener {

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

@@ -188,6 +188,26 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_auto_rotate_screen_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:padding="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_auto_rotate_screen"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/auto_rotate_screen"/>
+
+        </RelativeLayout>
+
         <RelativeLayout
             android:id="@+id/settings_show_media_holder"
             android:layout_width="match_parent"