Added Demos to Delphi Tips repo

There were some well hidden demos for a smattering of the tips on the Delphi Tips microsite that had been mouldering away over on a long forgotten Assembla repo.

On rediscovering them the other day I copied them over to the demos directory of the delphi-tips repo on GitHub.

Like the tips, the demos are quite elderly, but some of them may still prove useful. Of course, if anyone would like to add any more, you're welcome to fork away.



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