Added the MycenaeIII sign to decals.dmi

Added the MycenaeIII sign to decals.dmi
Mycenae added to v39l

-Added the mycenae
-Added the shuttle docks to the bridge
-Fixed the windows and added plating where it was missing on the mycenae
Merge pull request #77 from FlavoredCactus/Perseus

Added Mycenae and prison shuttle dock to metastationv39L.dmm