Allow to change meta level of standup fighters

eos/gamedata.py

@@ -530,6 +530,14 @@ class Item(EqBase):
     def isBooster(self):
         return self.group.name == 'Booster' and self.category.name == 'Implant'
 
+    @property
+    def isStandup(self):
+        if self.category.name == "Structure Module":
+            return True
+        if self.isFighter and {'fighterSquadronIsStandupLight', 'fighterSquadronIsStandupHeavy', 'fighterSquadronIsStandupSupport'}.intersection(self.attributes):
+            return True
+        return False
+
     def __repr__(self):
         return "Item(ID={}, name={}) at {}".format(
                 self.ID, self.name, hex(id(self))

eos/saveddata/fit.py

@@ -440,10 +440,8 @@ class Fit:
             return False
 
         # Citadel modules are now under a new category, so we can check this to ensure only structure modules can fit on a citadel
-        if isinstance(self.ship, Citadel) and item.category.name != "Structure Module" or \
-                not isinstance(self.ship, Citadel) and item.category.name == "Structure Module":
+        if isinstance(self.ship, Citadel) is not item.isStandup:
             return False
-
         return True
 
     def clear(self, projected=False, command=False):