#2873 NORM Untriag: activity class should initialize and show toolbox by default

[Zarro Boogs per Child]

#2873: activity class should initialize and show toolbox by default
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 Reporter:  ywwg    |       Owner:  marco    
     Type:  defect  |      Status:  new      
 Priority:  normal  |   Milestone:  Untriaged
Component:  sugar   |     Version:           
 Keywords:          |    Verified:  0        
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 Right now an activity must perform some "unbreakme" behavior on startup.
 Each activity must create and show a toolbox:

 {{{
 toolbox = activity.ActivityToolbox(self)
 self.set_toolbox(toolbox)
 toolbox.show()
 }}}

 Without this code it isn't possible to quit the activity.

 Suggestion:
 Add a self._toolbox member to the activity class and show it by default.
 Activities that don't want to use a toolbox can explicitly hide it.  It
 makes more sense to me to have the toolbox be the default, and require
 extra effort to hide it.

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Ticket URL: <https://dev.laptop.org/ticket/2873>
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