Improved progress bar popups for downloads

Now shows the filename, and also there's a delay mode where they'll only
be visible if the download takes more than a second, plus they can be
named.

Core/WebServer.cpp

@@ -64,7 +64,7 @@ static ServerStatus RetrieveStatus() {
 static bool RegisterServer(int port) {
 	bool success = false;
 	http::Client http;
-	http::RequestProgress progress;
+	net::RequestProgress progress;
 	Buffer theVoid = Buffer::Void();
 
 	http.SetUserAgent(StringFromFormat("PPSSPP/%s", PPSSPP_GIT_VERSION));