[Lazarus] Docking manager implementation

[Hans-Peter Diettrich]

Mattias Gaertner schrieb:

>>> The LCL needs an widgetset independent layout manager.
>> Right. But since we have to define an interface, we could look at 
>> existing layout manager models. Perhaps we can use some of the
>> widgetset managers without much extra coding? 
> 
> I doubt that. At least for the gtk I don't see how that should work.
> For example how should a TControl work with that?

Okay, if TControls are unknown to the widgetsets, we have to implement 
our own layout managers.

DoDi