Added function to notify ScriptLanguage when a thread is created/freed, allows scripts to allocate a stack there via TLS

platform/winrt/thread_winrt.cpp

@@ -33,6 +33,8 @@
 Thread* ThreadWinrt::create_func_winrt(ThreadCreateCallback p_callback,void *p_user,const Settings&) {
 
 	ThreadWinrt* thread = memnew(ThreadWinrt);
+
+
 	std::thread new_thread(p_callback, p_user);
 	std::swap(thread->thread, new_thread);