Refactor inventory management, add tweak, combine and inspect modes

src/Dodge/Default/Weapon.hs

@@ -43,3 +43,12 @@ defaultAutoGun = defaultGun
     , _itScrollDown = const id
     , _itInvDisplay = basicWeaponDisplay
     }
+
+defaultShellAmmo :: Ammo
+defaultShellAmmo = ShellAmmo
+    { _amPayload = \_ -> id
+    , _amString = "Shell"
+    , _amPjMove = []
+    , _amPjDraw = \_ -> blank
+    , _amParamSel = 0
+    }