Remove a lot of error code and error handling madness.

MMCError.h

@@ -0,0 +1,29 @@
+#pragma once
+#include <exception>
+#include <QString>
+#include <logger/QsLog.h>
+
+class MMCError : public std::exception
+{
+public:
+	MMCError(QString cause)
+	{
+		exceptionCause = cause;
+		QLOG_ERROR() << errorName() + ": " + cause;
+	};
+	virtual ~MMCError(){};
+	virtual const char *what() const noexcept
+	{
+		return exceptionCause.toLocal8Bit();
+	};
+	virtual QString cause() const
+	{
+		return exceptionCause;
+	}
+	virtual QString errorName()
+	{
+		return "MultiMC Error";
+	}
+private:
+	QString exceptionCause;
+};