GH-1795 add terminal launch option to use a specific Minecraft profile

Used like this:
```
./MultiMC --launch 1.17.1 --profile MultiMCTest --server mc.hypixel.net
```

launcher/LaunchController.h

@@ -4,6 +4,7 @@
 #include <tools/BaseProfiler.h>
 
 #include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/auth/MinecraftAccount.h"
 
 class InstanceWindow;
 class LaunchController: public Task
@@ -15,39 +16,45 @@ public:
     LaunchController(QObject * parent = nullptr);
     virtual ~LaunchController(){};
 
-    void setInstance(InstancePtr instance)
-    {
+    void setInstance(InstancePtr instance) {
         m_instance = instance;
     }
-    InstancePtr instance()
-    {
+
+    InstancePtr instance() {
         return m_instance;
     }
-    void setOnline(bool online)
-    {
+
+    void setOnline(bool online) {
         m_online = online;
     }
-    void setProfiler(BaseProfilerFactory *profiler)
-    {
+
+    void setProfiler(BaseProfilerFactory *profiler) {
         m_profiler = profiler;
     }
-    void setParentWidget(QWidget * widget)
-    {
+
+    void setParentWidget(QWidget * widget) {
         m_parentWidget = widget;
     }
-    void setServerToJoin(MinecraftServerTargetPtr serverToJoin)
-    {
+
+    void setServerToJoin(MinecraftServerTargetPtr serverToJoin) {
         m_serverToJoin = std::move(serverToJoin);
     }
+
+    void setAccountToUse(MinecraftAccountPtr accountToUse) {
+        m_accountToUse = std::move(accountToUse);
+    }
+
     QString id()
     {
         return m_instance->id();
     }
+
     bool abort() override;
 
 private:
     void login();
     void launchInstance();
+    void decideAccount();
 
 private slots:
     void readyForLaunch();
@@ -62,6 +69,7 @@ private:
     InstancePtr m_instance;
     QWidget * m_parentWidget = nullptr;
     InstanceWindow *m_console = nullptr;
+    MinecraftAccountPtr m_accountToUse = nullptr;
     AuthSessionPtr m_session;
     shared_qobject_ptr<LaunchTask> m_launcher;
     MinecraftServerTargetPtr m_serverToJoin;