GH-338, GH-513, GH-700 Unify edit instance with console window

* The resulting instance window can be closed at any point.
* Main window is kept open and running instances are marked with a badge.
* Multiple instances can now run from the same MultiMC - it's even more **multi** now.
* MultiMC can be entirely closed, keeping Minecraft(s) running.

application/InstanceWindow.h

@@ -0,0 +1,68 @@
+/* Copyright 2013-2015 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QMainWindow>
+#include "LaunchInteraction.h"
+#include <QObjectPtr.h>
+#include <QSystemTrayIcon>
+#include "launch/LaunchTask.h"
+#include "pages/BasePageContainer.h"
+
+class QPushButton;
+class PageContainer;
+class InstanceWindow : public QMainWindow, public BasePageContainer
+{
+	Q_OBJECT
+
+public:
+	explicit InstanceWindow(InstancePtr proc, QWidget *parent = 0);
+	virtual ~InstanceWindow();
+
+	bool selectPage(QString pageId) override;
+
+	QString instanceId();
+
+signals:
+	void isClosing();
+
+private
+slots:
+	void on_closeButton_clicked();
+	void on_btnKillMinecraft_clicked();
+
+	void onSucceeded();
+	void onFailed(QString reason);
+	void onProgressRequested(Task *task);
+
+	void on_InstanceLaunchTask_changed(std::shared_ptr<LaunchTask> proc);
+	void on_RunningState_changed(bool running);
+
+protected:
+	void closeEvent(QCloseEvent *) override;
+
+private:
+	void setKillButton(bool kill);
+
+private:
+	std::shared_ptr<LaunchTask> m_proc;
+	unique_qobject_ptr<LaunchController> m_launchController;
+	InstancePtr m_instance;
+	bool m_mayclose = true;
+	PageContainer *m_container = nullptr;
+	QPushButton *m_closeButton = nullptr;
+	QPushButton *m_killButton = nullptr;
+};