Expose mass, capacity & volume in item stats (raw for now, not pwetty)

gui/itemStats.py

@@ -253,6 +253,11 @@ class ItemParams (wx.Panel):
             attrs = self.stuff.chargeModifiedAttributes if self.stuff is not None else self.item.attributes
             attrsInfo = self.item.attributes if self.stuff is None else self.stuff.charge.attributes
 
+        attrs["volume"] = self.item.volume
+        attrs["capacity"] = self.item.capacity
+        if self.item.mass != 0:
+            attrs["mass"] = self.item.mass
+
         names = list(attrs.iterkeys())
         names.sort()
 
@@ -261,7 +266,9 @@ class ItemParams (wx.Panel):
         for name in names:
             info = attrsInfo.get(name)
 
-            value = attrs[name] if self.stuff is not None else attrs[name].value
+            att = attrs[name]
+            val = getattr(att, "value", None)
+            value = val if val is not None else att
 
             if self.toggleView != 1:
                 attrName = name