[Bugs] #2156 UNSP: Make palettes lazy

[Sugar Labs Bugs]

#2156: Make palettes lazy
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    Reporter:  erikos                     |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 We want to make palettes lazy to reduce memory usage.

 If the palette needs to be updated (e.g. the palette of an Access POint or
 Ad-hoc network) we add the logic in a model class that both the icon and
 the palette listen to and propagating the NM signal with gobject signals
 or have the icon and palette listening directly to NM, depends how much
 code is that and how tricky.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2156>
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