added game_state_changed event

vmf_source/scripts/mods/vmf/modules/mods.lua

@@ -85,3 +85,12 @@ vmf.mods_update = function(dt)
     end
   end
 end
+
+-- call 'game_state_changed' for every mod which definded it
+vmf.mods_game_state_changed = function(status, state)
+  for _, mod in pairs(MODS) do --@TODO: maybe ipairs?
+    if mod.game_state_changed then
+      mod.game_state_changed(status, state)
+    end
+  end
+end

vmf_source/scripts/mods/vmf/vmf_loader.lua

@@ -36,6 +36,7 @@ return{
 
 	on_game_state_changed = function(object, status, state)
 		print("VMF:ON_GAME_STATE_CHANGED(), status: " .. tostring(status) .. ", state: " .. tostring(state))
+		object.vmf.mods_game_state_changed(status, state)
 		object.vmf.save_unsaved_settings_to_file()
 	end
 }