Flesh out typing information, enforce.

gen/forcedoptionsgen.py

@@ -43,7 +43,7 @@ class ForcedOptionsGenerator:
         if blue.unrestricted_satnav or red.unrestricted_satnav:
             self.mission.forced_options.unrestricted_satnav = True
 
-    def generate(self):
+    def generate(self) -> None:
         self._set_options_view()
         self._set_external_views()
         self._set_labels()