[Icon Plasmoid] Provide a generic plasmoid class for icon based plasmoid

[Loïc Marteau]

Hi all

Here is the patch I made for IconApplet in order to use this 
implementation.
This patch need reviews and *correction* as i'm not sure i have done the 
right thing about constraintsEvent.
The result is that .desktop icon plasmoids take less width place in the 
panel.

In fact i have some question :
1) in void IconApplet::constraintsEvent(Plasma::Constraints constraints)
the first line is
    setBackgroundHints(NoBackground);
    is this really needed each time we call constraintsEvent as it is 
already done in the constructor ?

2) When plasmoid is in the panel i call 
setAspectRatioMode(Plasma::Square) to let plasma:square related code do 
the stuff with size constraint
is there a way to unset this in Desktop mode bracket (formFactor() == 
Plasma::Planar || formFactor() == Plasma::MediaCenter)

3) Should i call a resize() (and with witch parameter ?) after the call 
setAspectRatioMode(Plasma::Square) in constraintevent method ?

4) Is there issue with this code ?

Thanks and cheers !

PS : according to what we said in the thread the idea is to provide a 
common simple and correct way to implement size constraints stuff in all 
icon based plasmoid.
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