SDWF 0.52 release

[Stewart Gordon]

A few changes have taken place in TreeView:

- TreeView.Item is now TreeItem, making it consistent with MenuItem
- TreeItem objects can be created by the application and are not 
auto-destructed on removal, making it possible to use a derived class to 
store extra information
- a bug with AAs introduced somewhere around DMD 0.151 has been averted

There have also been a few minor additions to the EditBox class.  But 
does anyone know why EditBox.scrollPosition doesn't seem to be working 
at all in a single-line edit box?

Stewart.

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