Implemented version list sorting.

Resolves MMC-8:
	https://jira.forkk.net/browse/MMC-8

libmultimc/include/instversion.h

@@ -104,6 +104,30 @@ public:
 	 */
 	virtual InstVersion *copyVersion(InstVersionList *newParent) const = 0;
 	
+	/*!
+	 * 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 isLessThan(const InstVersion &other) const;
+	
+	/*!
+	 * 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 isGreaterThan(const InstVersion &other) const;
+	
+	/*!
+	 * \sa shouldSortBefore()
+	 */
+	virtual bool operator<(const InstVersion &rhs) { return isLessThan(rhs); }
+	
+	/*!
+	 * \sa shouldSortAfter()
+	 */
+	virtual bool operator>(const InstVersion &rhs) { return isGreaterThan(rhs); }
+	
 protected:
 	QString m_descriptor;
 	QString m_name;

libmultimc/include/instversionlist.h

@@ -88,6 +88,11 @@ public:
 	 */
 	virtual const InstVersion *getLatestStable();
 	
+	/*!
+	 * Sorts the version list.
+	 */
+	virtual void sort() = 0;
+	
 protected slots:
 	/*!
 	 * Updates this list with the given list of versions.

libmultimc/include/minecraftversionlist.h

@@ -45,12 +45,14 @@ public:
 	virtual const InstVersion *at(int i) const;
 	virtual int count() const;
 	virtual void printToStdOut() const;
+	virtual void sort();
 	
 	/*!
 	 * Gets the main version list instance.
 	 */
 	static MinecraftVersionList &getMainList();
 	
+	
 protected:
 	QList<InstVersion *>m_vlist;