Mk2Rev1

various bugfixes and such.
also bookmarks, temp song loaderm and undo overhaul with near complete multiplayer, but menu items disabled. i really wish i could split this into multiple commits, but i don't know how to work unreal.

Plugins/ZipUtility-ue4/ThirdParty/7zpp/Include/ListCallback.h

@@ -0,0 +1,23 @@
+#pragma once
+
+
+#include "SevenZipLibrary.h"
+#include "CompressionFormat.h"
+
+
+namespace SevenZip
+{
+	class ListCallback
+	{
+	public:
+		/*
+		Called for each file found in the archive. Size in bytes.
+		*/
+		virtual void OnFileFound(const TString& archivePath, const TString& filePath, int size) {}
+
+		/*
+		Called when all the files have been listed
+		*/
+		virtual void OnListingDone(const TString& archivePath) {}
+	};
+}