[added] Unrest maps

[sstair]

I'm working on maps for Unrest, and have finished the ground floor/outdoor map.

If you want to try the map out, you can add the following fragment to your core_mapstyles.xml

<ImageStyle Name="exp03_dun_estate_of_unrest" zonerect="-175, -110, 169, 291">
<ImageFrame Name="imageFrame" Source="images/maps/map_exp03_dun_estate_of_unrest.dds" SourceRect="0,0,436,506"/>
</ImageStyle>