Add seekbar and list settings preferences

Taken from AICP

res/values/seekbar_preference_attrs.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--  Copyright (C) 2014-2017 AICP
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ -->
+
+<resources>
+
+    <declare-styleable name="SeekBarPreference">
+        <!-- preference -->
+        <attr name="unitsLeft" format="string|reference" />
+        <attr name="unitsRight" format="string|reference" />
+        <attr name="interval" format="integer" />
+        <!-- style -->
+        <attr name="thumb_default_value_color" format="color" />
+        <attr name="value_popup_view_fg" format="color" />
+        <attr name="value_popup_view_bg" format="color" />
+    </declare-styleable>
+
+</resources>