One handed mode toggle [3/3]

Change-Id: I7add2cd574cfe3a5f274e49480f0a25e8f16d464

res/values/aicp_strings.xml

@@ -238,6 +238,8 @@
    <string name="smartbar_config_backup_error_toast">Error saving Smartbar profile</string>
    <string name="smartbar_config_restore_error_toast">Error restoring Smartbar profile</string>
    <string name="navbar_buttons_alpha_title">Button transparency</string>
    <string name="one_handed_mode_title">One handed mode</string>
    <string name="one_handed_mode_summary">Allows swiping on the navigation bar to enable one handed mode</string>

    <string name="link_volume_option_title">Link ringtone &amp; notification volumes</string>

res/xml/smartbar_settings.xml

@@ -44,6 +44,12 @@
        android:entryValues="@array/smartbar_button_animation_values"
        android:summary="@string/smartbar_button_animation_summary" />

    <com.android.settings.preference.SecureSettingSwitchPreference
        android:key="one_handed_mode_ui"
        android:title="@string/one_handed_mode_title"
        android:summary="@string/one_handed_mode_summary"
        android:defaultValue="false" />

    <com.android.settings.aicp.preference.CustomSeekBarPreference
        android:key="navbar_buttons_alpha"
        android:title="@string/navbar_buttons_alpha_title"