rename, add hdpi icons, cleanup some warnings

[FreeShisen] / res / values / arrays.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="sizes">
        <item>Small</item>
        <item>Medium</item>
        <item>Large</item>
    </string-array>
    <string-array name="difficulties">
        <item>Easy</item>
        <item>Hard</item>
    </string-array>
    
</resources>