[Trac #728] Inactive/Absent Icon Implementation

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#728: Inactive/Absent Icon Implementation
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 Reporter:  Eben    |       Owner:  dcbw   
     Type:  task    |      Status:  new    
 Priority:  normal  |   Milestone:  BTest-3
Component:  sugar   |    Keywords:         
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 The spec for this has been laid out in ticket #695, and also resides in
 the
 [http://wiki.laptop.org/go/OLPC_Human_Interface_Guidelines/The_Sugar_Interface/Icons#Active_vs._Inactive_Icons
 HIG].  It nows needs an implementation.  It would be useful to include a
 simple API for it. In much the same way that an activity can assign XO
 colors to any icon, they should also be able to render any icon as
 disabled/inactive.

 Optimally, this would work like:  getInactiveIcon(mySVG), which would
 return a reference to the appropriately modified SVG.  This would leave
 the door open for us to later change things like stroke weight, which we
 might want to make lighter to further emphasize inactivity.  Making it a
 single call prevents future changes to visual spec from requiring changes
 in the activity code.

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Ticket URL: <http://dev.laptop.org/ticket/728>
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