Regedit: Cancel rename if value to rename to already exists

[Robert Shearman]

Hi,

Before this patch we blindly overwrote existing values when renaming.
Now we don't and cancel the operation. Also added some cvsignore's for
the folder bitmaps.

Rob

Changelog:
- Cancel rename if value to rename to already exists
- Add folder?.bmp to .cvsignore

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