fix(lua) (#1697)

- sandbox stuff.
- Fix lua scripts that could run when their lua state was destroyed, causing chaos.

src/script_mgr.cpp

@@ -33,6 +33,11 @@ namespace big
 		m_scripts.clear();
 	}
 
+	void script_mgr::add_on_script_batch_removed(std::function<void()> f)
+	{
+		m_on_script_batch_removed.push(f);
+	}
+
 	void script_mgr::tick()
 	{
 		gta_util::execute_as_script(RAGE_JOAAT("main_persistent"), std::mem_fn(&script_mgr::tick_internal), this);
@@ -62,6 +67,18 @@ namespace big
 			return iter->m_should_be_deleted;
 		});
 
+		while (m_on_script_batch_removed.size())
+		{
+			auto& f = m_on_script_batch_removed.front();
+
+			if (f)
+			{
+				f();
+			}
+
+			m_on_script_batch_removed.pop();
+		}
+
 		if (g_lua_manager->m_schedule_reload_modules)
 		{
 			g_lua_manager->load_all_modules();