Move "auto_rescan" setting in main setting page

vlc-android/res/values/strings.xml

@@ -438,6 +438,7 @@
     <string name="player_touch_disable_all">Disable all Touch controls</string>
     <string name="tv_ui_title">Android TV interface</string>
     <string name="tv_ui_summary">Change UI to TV adapted theme</string>
+    <string name="medialibrary">Media library</string>
     <string name="medialibrary_directories">Media library folders</string>
 
     <!--Accessibility-->

vlc-android/res/xml/preferences.xml

@@ -2,11 +2,20 @@
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     android:title="@string/preferences">
 
+    <PreferenceCategory android:title="@string/medialibrary" >
         <PreferenceScreen
             android:key="directories"
             android:summary="@string/directories_summary"
             android:title="@string/medialibrary_directories" />
 
+        <CheckBoxPreference
+            android:defaultValue="true"
+            android:key="auto_rescan"
+            android:summary="@string/auto_rescan_summary"
+            android:title="@string/auto_rescan" />
+    </PreferenceCategory>
+
+    <PreferenceCategory android:title="@string/video_prefs_category" >
         <ListPreference
             android:defaultValue="-1"
             android:entries="@array/hardware_acceleration_list"
@@ -21,12 +30,15 @@
             android:entryValues="@array/screen_orientation_values"
             android:key="screen_orientation"
             android:title="@string/screen_orientation" />
+    </PreferenceCategory>
 
+    <PreferenceCategory android:title="@string/history" >
         <CheckBoxPreference
             android:defaultValue="true"
             android:key="playback_history"
             android:summary="@string/playback_history_summary"
             android:title="@string/playback_history_title" />
+    </PreferenceCategory>
 
     <PreferenceCategory android:title="@string/extra_prefs_category" >
         <Preference

vlc-android/res/xml/preferences_adv.xml

@@ -3,12 +3,6 @@
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     android:title="@string/advanced_prefs_category">
 
-    <CheckBoxPreference
-        android:defaultValue="true"
-        android:key="auto_rescan"
-        android:summary="@string/auto_rescan_summary"
-        android:title="@string/auto_rescan" />
-
     <CheckBoxPreference
         android:defaultValue="false"
         android:key="browser_show_hidden_files"