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/AccountData.h

@@ -21,6 +21,12 @@ struct Cape {
     QByteArray data;
 };
 
+struct MinecraftEntitlement {
+    bool ownsMinecraft = false;
+    bool canPlayMinecraft = false;
+    Katabasis::Validity validity = Katabasis::Validity::None;
+};
+
 struct MinecraftProfile {
     QString id;
     QString name;
@@ -69,5 +75,6 @@ struct AccountData {
 
     Katabasis::Token yggdrasilToken;
     MinecraftProfile minecraftProfile;
+    MinecraftEntitlement minecraftEntitlement;
     Katabasis::Validity validity_ = Katabasis::Validity::None;
 };