NOISSUE do not keep downloads in memory, add (some) missing virtual dtors

api/logic/minecraft/launch/ClaimAccount.h

@@ -23,6 +23,8 @@ class ClaimAccount: public LaunchStep
 	Q_OBJECT
 public:
 	explicit ClaimAccount(LaunchTask *parent, AuthSessionPtr session);
+	virtual ~ClaimAccount() {};
+
 	void executeTask() override;
 	void finalize() override;
 	bool canAbort() const override

api/logic/minecraft/launch/CreateServerResourcePacksFolder.h

@@ -25,6 +25,8 @@ class CreateServerResourcePacksFolder: public LaunchStep
 	Q_OBJECT
 public:
 	explicit CreateServerResourcePacksFolder(LaunchTask *parent);
+	virtual ~CreateServerResourcePacksFolder() {};
+
 	virtual void executeTask();
 	virtual bool canAbort() const
 	{

api/logic/minecraft/launch/DirectJavaLaunch.h

@@ -24,6 +24,8 @@ class DirectJavaLaunch: public LaunchStep
 	Q_OBJECT
 public:
 	explicit DirectJavaLaunch(LaunchTask *parent);
+	virtual ~DirectJavaLaunch() {};
+
 	virtual void executeTask();
 	virtual bool abort();
 	virtual void proceed();

api/logic/minecraft/launch/LauncherPartLaunch.h

@@ -24,6 +24,8 @@ class LauncherPartLaunch: public LaunchStep
 	Q_OBJECT
 public:
 	explicit LauncherPartLaunch(LaunchTask *parent);
+	virtual ~LauncherPartLaunch() {};
+
 	virtual void executeTask();
 	virtual bool abort();
 	virtual void proceed();