Refactor icon lists heavily

* Icon list now uses a filesystem watcher for updates
* Icon folder is user-customizable
* All the little details. ALL OF THEM.

logic/icons/MMCIcon.h

@@ -0,0 +1,52 @@
+/* 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 <QString>
+#include <QDateTime>
+#include <QIcon>
+struct MMCImage
+{
+	QIcon icon;
+	QString filename;
+	QDateTime changed;
+	bool present() const
+	{
+		return !icon.isNull();
+	}
+};
+
+struct MMCIcon
+{
+	enum Type : unsigned
+	{
+		Builtin,
+		Transient,
+		FileBased,
+		ICONS_TOTAL,
+		ToBeDeleted
+	};
+	QString m_key;
+	QString m_name;
+	MMCImage m_images[ICONS_TOTAL];
+	Type m_current_type = ToBeDeleted;
+
+	Type type() const;
+	QString name() const;
+	bool has(Type _type) const;
+	QIcon icon() const;
+	void remove(Type rm_type);
+	void replace(Type new_type, QIcon icon, QString path = QString());
+};