[fpc-pascal] mixin feature

[Bee Jay]

> I'm not aware of any existing AOP framework for Pascal.

I don't think neither GWT or QWT is implementing AOP. CMIIW.

> I think the regular way to do this in Object Pascal is via  
> implements-style delegation (which doesn't really fake mixins; I  
> think it provides exactly the same functionality, just using a  
> slightly different concept). I don't think that's already fully  
> functional in FPC, but Florian and Sergei (Gorelkin) have recently  
> improved it quite a bit.

Yes. I also think class helper feature may provide similar  
functionality. But AFAIK FPC doesn't yet support either feature. :(

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