Add seekbar and list settings preferences

Taken from AICP

res/values/seekbar_preference_attrs.xml

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+<?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>

res/values/seekbar_preference_dimens.xml

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+<resources>
+
+    <!-- SeekBarPreferenceCham: offset of the value popup -->
+    <dimen name="seek_bar_preference_cham_value_x_offset">0dp</dimen>
+    <dimen name="seek_bar_preference_cham_value_y_offset">-16dp</dimen>
+
+</resources>

res/values/seekbar_preference_strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/**
+ * Copyright (C) 2017 AICP
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+-->
+
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+
+    <string name="seekbar_no_default_value">No default value set</string>
+    <string name="seekbar_default_value_set">Value set to default of <xliff:g id="number">%d</xliff:g></string>
+    <string name="seekbar_default_value_already_set">Default value is already set</string>
+    <string name="seekbar_default_string">Default</string>
+
+</resources>

res/values/seekbar_preference_styles.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--  Copyright (C) 2018 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>
+
+    <style name="SeekBarPreferenceChamValueTextAppearance" parent="@*android:style/TextAppearance.Toast" />
+
+    <!-- SeekBarPreferenceCham value popup -->
+    <style name="SeekBarPreferenceChamValueView">
+        <item name="android:textColor">?attr/value_popup_view_fg</item>
+        <item name="android:textAppearance">@style/SeekBarPreferenceChamValueTextAppearance</item>
+        <item name="android:background">@drawable/seekbar_popup_bg</item>
+        <item name="android:paddingHorizontal">24dp</item>
+        <item name="android:paddingVertical">15dp</item>
+        <item name="android:fitsSystemWindows">false</item>
+    </style>
+
+</resources>