GH-4217 Add support for GamePass accounts and MC profile setup

- We now use the new endpoint for loggiong in via XBox tokens (/launcher/login)
- We now check game entitlements instead of only relying on MC profile presence
- Accounts can now be added even when they do not have a profile
- The launcher will guide you through selecting a Minecraft name if you don't have one yet

launcher/minecraft/auth/flows/Parsers.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "minecraft/auth/AccountData.h"
+
+namespace Parsers
+{
+    bool getDateTime(QJsonValue value, QDateTime & out);
+    bool getString(QJsonValue value, QString & out);
+    bool getNumber(QJsonValue value, double & out);
+    bool getNumber(QJsonValue value, int64_t & out);
+    bool getBool(QJsonValue value, bool & out);
+
+    bool parseXTokenResponse(QByteArray &data, Katabasis::Token &output, const char * name);
+    bool parseMojangResponse(QByteArray &data, Katabasis::Token &output);
+
+    bool parseMinecraftProfile(QByteArray &data, MinecraftProfile &output);
+    bool parseMinecraftEntitlements(QByteArray &data, MinecraftEntitlement &output);
+    bool parseRolloutResponse(QByteArray &data, bool& result);
+}