[PR] Remove updater (#363)

* feat: launch slippi.gg/downloads on update

* fix: use open command on mac

Source/Core/Core/Slippi/SlippiUser.cpp

@@ -181,48 +181,18 @@ void SlippiUser::OpenLogInPage()
 
 bool SlippiUser::UpdateApp()
 {
-#ifdef _WIN32
-	auto isoPath = SConfig::GetInstance().m_strFilename;
-
-	std::string path = File::GetExeDirectory() + "/dolphin-slippi-tools.exe";
-	std::string echoMsg = "echo Starting update process. If nothing happens after a few "
-	                      "minutes, you may need to update manually from https://slippi.gg/netplay ...";
+	std::string url = "https://slippi.gg/downloads?update=true";
 
-	// Check if updater exists, anti-virus sometimes deletes it
-	if (!File::Exists(path))
-	{
-		ERROR_LOG(SLIPPI_ONLINE, "Update requested but updater does not exist.");
-		OSD::AddMessage("Updater cannot be found. Please download the latest Slippi version from slippi.gg.", 30000,
-		                0xFFFF0000);
-		return false;
-	}
-
-	std::string command = "start /b cmd /c " + echoMsg + " && \"" + path + "\" app-update -launch -iso \"" + isoPath +
-	                      "\" -version \"" + scm_slippi_semver_str + "\"";
-	WARN_LOG(SLIPPI, "Executing app update command: %s", command);
-	RunSystemCommand(command);
-	return true;
+#ifdef _WIN32
+	std::string command = "explorer \"" + url + "\"";
 #elif defined(__APPLE__)
-	CriticalAlertT("Automatic updates are not available for standalone Netplay builds on macOS. Please get the latest "
-	               "update from slippi.gg/netplay. "
-	               "(The Slippi Launcher has automatic updates on macOS, and you should consider switching to that)");
-	return false;
+	std::string command = "open \"" + url + "\"";
 #else
-	const char *appimage_path = getenv("APPIMAGE");
-	const char *appmount_path = getenv("APPDIR");
-	if (!appimage_path)
-	{
-		CriticalAlertT("Automatic updates are not available for non-AppImage Linux builds.");
-		return false;
-	}
-	std::string path(appimage_path);
-	std::string mount_path(appmount_path);
-	std::string command = mount_path + "/usr/bin/appimageupdatetool " + path;
-	WARN_LOG(SLIPPI, "Executing app update command: %s", command.c_str());
-	RunSystemCommand(command);
-	CriticalAlertT("Dolphin failed to update, please head over to the Slippi Discord for support.");
-	return false;
+	std::string command = "xdg-open \"" + url + "\""; // Linux
 #endif
+
+	RunSystemCommand(command);
+	return true;
 }
 
 void SlippiUser::ListenForLogIn()