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.

api/logic/BaseInstance.cpp

@@ -92,11 +92,14 @@ bool BaseInstance::isRunning() const
 
 void BaseInstance::setRunning(bool running)
 {
-	if(running && !m_isRunning)
+	if(running == m_isRunning)
+		return;
+
+	if(running)
 	{
 		m_timeStarted = QDateTime::currentDateTime();
 	}
-	else if(!running && m_isRunning)
+	else
 	{
 		qint64 current = settings()->get("totalTimePlayed").toLongLong();
 		QDateTime timeEnded = QDateTime::currentDateTime();
@@ -104,6 +107,8 @@ void BaseInstance::setRunning(bool running)
 		emit propertiesChanged(this);
 	}
 	m_isRunning = running;
+
+	emit runningStatusChanged(running);
 }
 
 int64_t BaseInstance::totalTimePlayed() const
@@ -179,7 +184,7 @@ void BaseInstance::unsetFlag(const BaseInstance::InstanceFlag flag)
 
 bool BaseInstance::canLaunch() const
 {
-	return !(flags() & VersionBrokenFlag);
+	return (!(flags() & VersionBrokenFlag)) && (!isRunning());
 }
 
 bool BaseInstance::reload()
@@ -268,3 +273,8 @@ QStringList BaseInstance::extraArguments() const
 {
 	return Commandline::splitArgs(settings()->get("JvmArgs").toString());
 }
+
+std::shared_ptr<LaunchTask> BaseInstance::getLaunchTask()
+{
+	return m_launchProcess;
+}

api/logic/BaseInstance.h

@@ -157,6 +157,9 @@ public:
 	/// returns a valid launcher (task container)
 	virtual std::shared_ptr<LaunchTask> createLaunchTask(AuthSessionPtr account) = 0;
 
+	/// returns the current launch task (if any)
+	std::shared_ptr<LaunchTask> getLaunchTask();
+
 	/*!
 	 * Returns a task that should be done right before launch
 	 * This task should do any extra preparations needed
@@ -231,6 +234,10 @@ signals:
 
 	void flagsChanged();
 
+	void launchTaskChanged(std::shared_ptr<LaunchTask>);
+
+	void runningStatusChanged(bool running);
+
 protected slots:
 	void iconUpdated(QString key);
 
@@ -240,6 +247,7 @@ protected:
 	SettingsObjectPtr m_settings;
 	InstanceFlags m_flags;
 	bool m_isRunning = false;
+	std::shared_ptr<LaunchTask> m_launchProcess;
 	QDateTime m_timeStarted;
 };
 

api/logic/minecraft/MinecraftInstance.cpp

@@ -465,7 +465,9 @@ std::shared_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPtr s
 	{
 		process->setCensorFilter(createCensorFilterFromSession(session));
 	}
-	return process;
+	m_launchProcess = process;
+	emit launchTaskChanged(m_launchProcess);
+	return m_launchProcess;
 }
 
 QString MinecraftInstance::launchMethod()