define ship roles via added modules and allow multiple weapons

src/ui/VisualsConfig.h

@@ -55,14 +55,6 @@ struct ToastVisuals
     int    fontSize;
 };
 
-enum class ShipRole
-{
-    PlayerCombat,
-    Salvage,
-    Repair,
-    Enemy,
-};
-
 struct VisualsConfig
 {
     TileVisuals asteroid;
@@ -70,7 +62,7 @@ struct VisualsConfig
 
     std::map<BuildingType, BuildingVisuals> buildings;
     std::map<std::string,  ItemVisuals>     items;
-    std::map<ShipRole,     ShipVisuals>     ships;
+    std::map<std::string,  ShipVisuals>     ships;
 
     BeamVisuals    beams;
     OverlayVisuals overlays;