Very early KRWorldBuilder scaffolding in progress.

New KRVector3 math functions

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extra : convert_revision : svn%3A7752d6cf-9f14-4ad2-affc-04f1e67b81a5/trunk%4058

KRWorldBuilder/KRWorldBuilder/KRWBFileSystemItem.h

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+//
+//  KRWBFileSystemItem.h
+//  KRWorldBuilder
+//
+//  Created by Kearwood Gilbert on 12-05-12.
+//  Copyright (c) 2012 Kearwood Software. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface KRWBFileSystemItem : NSObject
+{
+    NSURL *fullPath;
+    KRWBFileSystemItem *parent;
+    NSMutableArray *children;
+}
+
++ (KRWBFileSystemItem *)rootItem;
+- (NSInteger)numberOfChildren;// Returns -1 for leaf nodes
+- (KRWBFileSystemItem *)childAtIndex:(NSUInteger)n; // Invalid to call on leaf nodes
+- (NSURL *)fullPath;
+- (NSString *)relativePath;
+
+@end
+