Move all the things (YES. Move them.)

Also, implemented some basic modlist logic, to be wired up.

logic/InstanceVersion.h

@@ -0,0 +1,68 @@
+/* Copyright 2013 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 <QSharedPointer>
+
+/*!
+ * An abstract base class for versions.
+ */
+struct InstVersion
+{
+	/*!
+	 * Checks if this version is less (older) than the given version.
+	 * \param other The version to compare this one to.
+	 * \return True if this version is older than the given version.
+	 */
+	virtual bool operator<(const InstVersion &rhs) const
+	{
+		return timestamp < rhs.timestamp;
+	}
+
+	/*!
+	 * Checks if this version is greater (newer) than the given version.
+	 * \param other The version to compare this one to.
+	 * \return True if this version is newer than the given version.
+	 */
+	virtual bool operator>( const InstVersion& rhs ) const
+	{
+		return timestamp > rhs.timestamp;
+	}
+	
+	/*!
+	 * A string used to identify this version in config files.
+	 * This should be unique within the version list or shenanigans will occur.
+	 */
+	QString descriptor;
+	/*!
+	 * The name of this version as it is displayed to the user.
+	 * For example: "1.5.1"
+	 */
+	QString name;
+	/*!
+	 * Gets the version's timestamp.
+	 * This is primarily used for sorting versions in a list.
+	 */
+	qint64 timestamp;
+	
+	virtual QString typeString() const
+	{
+		return "InstVersion";
+	}
+};
+
+typedef QSharedPointer<InstVersion> InstVersionPtr;
+
+Q_DECLARE_METATYPE( InstVersionPtr )