[Bugs] #1615 UNSP: Add a button in Physics Activity to clear off the whole screen at once

[Sugar Labs Bugs]

#1615: Add a button in Physics Activity to clear off the whole screen at once
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    Reporter:  mchua                      |          Owner:  garycmartin                
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Physics                    |        Version:  0.84.x                     
    Severity:  Unspecified                |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 (Dictated by Audrey Kim, age 6)

 Is there a button to clear off the whole screen? It'd be good if we
 wouldn't have to click around [to erase things] so much.

 Her older cousin Mel says: We're using Physics version 3 on an XO running
 the 0.84.2 Sugar build. I'd be willing to sit down with the Physics
 maintainer on IRC and make the change, because Physics seems to be a hit
 with the first-graders at Cambridge Friends School and I'd like to be able
 to tweak it in realtime and then submit those tweaks upstream.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1615>
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