[Lazarus] Docking deserves updates of the LCL

[Hans-Peter Diettrich]

Attached is the latest version of my docking manager, which can be used 
to demonstrate some flaws in the LCL. See the issues mentioned in the 
EasyDockSite unit header.

This version still lacks zone resize capabilities, but everything else 
has been implemented as far as possible with the current LCL.

Now it's time to think about the integration of this (or other) docking 
manager into the LCL. I could try to add the missing functionality to 
the LCL myself, but it would be easier if some other developer would fix 
the flaws, who is more familiar with the LCL than I am.

Most important are improved notifications of docking managers, so that 
these can react on changes to the docking site (resize...) and on the 
docked controls themselves (changed visibility...). Related is a more 
"conforming" behaviour of all controls, which should e.g. not undock 
immediately when they are simply clicked (both in floating and docked 
state).

For the implementation of notebooks with docked components, the 
interaction between the dock performer and the docking manager should be 
improved. Currently the landing zone and insertion mode (alignment) is 
determined exclusively by the control, onto which another control is 
dropped. This prevents the use of special docking modes, as e.g. docking 
into a notebook. IMO the docking manager should take over the visual 
feedback for drop zones and modes, instead of the docked controls, which 
have no special information about the capabilities of the docking 
manager of their dock site.

DoDi
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