Fix memory leak on exit when using webhooks

* Fix memory leak on exit when using webhooks

src/main.d

@@ -899,10 +899,6 @@ void performStandardExitProcess(string scopeCaller) {
 	// Who called this function
 	log.vdebug("Running performStandardExitProcess due to: ", scopeCaller);
 
-	// Wait for all parallel jobs that depend on the database to complete
-	log.vdebug("Wait for all parallel jobs that depend on the database to complete");
-	taskPool.finish(true);
-
 	// Shutdown the OneDrive API instance
 	if (oneDriveApiInstance !is null) {
 		log.vdebug("Shutdown OneDrive API instance");

src/onedrive.d

@@ -68,6 +68,7 @@ class OneDriveWebhook {
 	// Cache instantiation flag in thread-local bool
 	// Thread local
 	private static bool instantiated_;
+	private RequestServer server;
 
 	// Thread global
 	private __gshared OneDriveWebhook instance_;
@@ -107,10 +108,11 @@ class OneDriveWebhook {
 
 	void stop() {
 		if (this.started) {
-			RequestServer.stop();
+			server.stop();
 			this.started = false;
 		}
 		log.log("Stopped webhook server");
+		object.destroy(server);
 	}
 
 	// The static serve() is necessary because spawn() does not like instance methods
@@ -128,7 +130,7 @@ class OneDriveWebhook {
 	}
 
 	private void serveImpl() {
-		auto server = new RequestServer(host, port);
+		server = RequestServer(host, port);
 		server.serveEmbeddedHttp!handle();
 	}