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/AuthContext.h

@@ -63,6 +63,9 @@ protected:
     void doXBoxProfile();
     Q_SLOT void onXBoxProfileDone(QNetworkReply::NetworkError, QByteArray, QList<QNetworkReply::RawHeaderPair>);
 
+    void doEntitlements();
+    Q_SLOT void onEntitlementsDone(QNetworkReply::NetworkError, QByteArray, QList<QNetworkReply::RawHeaderPair>);
+
     void doMinecraftProfile();
     Q_SLOT void onMinecraftProfileDone(QNetworkReply::NetworkError, QByteArray, QList<QNetworkReply::RawHeaderPair>);
 
@@ -72,6 +75,8 @@ protected:
     void doGetSkin();
     Q_SLOT void onSkinDone(QNetworkReply::NetworkError, QByteArray, QList<QNetworkReply::RawHeaderPair>);
 
+    void succeed();
+
     void failResult(bool & flag);
     void succeedResult(bool & flag);
     void checkResult();
@@ -88,6 +93,7 @@ protected:
     int m_requestsDone = 0;
     bool m_xboxProfileSucceeded = false;
     bool m_mcAuthSucceeded = false;
+    QString entitlementsRequestId;
 
     QSet<int64_t> stsErrors;
     bool stsFailed = false;