Rewrote UpdateDownloader to Kotlin

Added auto update check (every 12 hour)
Warning message optional fix #256
Lots of bug fixes!

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt

@@ -70,16 +70,17 @@ class PreferenceKeys(context: Context) {
 
     val removeAfterMarkedAsRead = context.getString(R.string.pref_remove_after_marked_as_read_key)
 
-    val updateOnlyWhenCharging = context.getString(R.string.pref_update_only_when_charging_key)
-
     val libraryUpdateInterval = context.getString(R.string.pref_library_update_interval_key)
 
+    val libraryUpdateRestriction = context.getString(R.string.pref_library_update_restriction_key)
+
     val filterDownloaded = context.getString(R.string.pref_filter_downloaded_key)
 
     val filterUnread = context.getString(R.string.pref_filter_unread_key)
 
     fun sourceUsername(sourceId: Int) = "pref_source_username_$sourceId"
 
+
     fun sourcePassword(sourceId: Int) = "pref_source_password_$sourceId"
 
     fun syncUsername(syncId: Int) = "pref_mangasync_username_$syncId"

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -39,6 +39,11 @@ class PreferencesHelper(private val context: Context) {
                     context.getString(R.string.pref_library_update_interval_key), 0)
         }
 
+        fun getAutomaticUpdateStatus(context: Context): Boolean {
+            return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(
+                    context.getString(R.string.pref_enable_automatic_updates), false)
+        }
+
         @JvmStatic
         fun getTheme(context: Context): Int {
             return PreferenceManager.getDefaultSharedPreferences(context).getInt(
@@ -132,10 +137,10 @@ class PreferencesHelper(private val context: Context) {
 
     fun removeAfterMarkedAsRead() = prefs.getBoolean(keys.removeAfterMarkedAsRead, false)
 
-    fun updateOnlyWhenCharging() = prefs.getBoolean(keys.updateOnlyWhenCharging, false)
-
     fun libraryUpdateInterval() = rxPrefs.getInteger(keys.libraryUpdateInterval, 0)
 
+    fun libraryUpdateRestriction() = prefs.getStringSet(keys.libraryUpdateRestriction, emptySet())
+
     fun filterDownloaded() = rxPrefs.getBoolean(keys.filterDownloaded, false)
 
     fun filterUnread() = rxPrefs.getBoolean(keys.filterUnread, false)