ApplicationMessage: Use QHash instead of QMap

QHash provides faster lookup times than QMap because it uses a hash table to store the elements, while QMap uses a self-balancing binary tree.

Signed-off-by: Edgars Cīrulis <edgarsscirulis@gmail.com>

launcher/ApplicationMessage.h

@@ -1,12 +1,12 @@
 #pragma once
 
 #include <QString>
-#include <QMap>
+#include <QHash>
 #include <QByteArray>
 
 struct ApplicationMessage {
     QString command;
-    QMap<QString, QString> args;
+    QHash<QString, QString> args;
 
     QByteArray serialize();
     void parse(const QByteArray & input);