[Bugs] #3412 UNSP: Use gtk_accelerator_parse() instead of egg for key handling

[Sugar Labs Bugs]

#3412: Use gtk_accelerator_parse() instead of egg for key handling
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    Reporter:  dsd                        |          Owner:                             
        Type:  enhancement                |         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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 When porting the shell to GTK3, we can simplify the key grabbing (for
 Frame key, etc) code in sugar-toolkit-gtk3.

 We currently include eggaccelerators.c from libegg just to parse key names
 into codes that can be grabbed. This is now provided by GTK+ in the form
 of gtk_accelerator_parse() or its more flexible variant
 gtk_accelerator_parse_with_keycode(). We can switch to that and remove the
 egg code.

 https://bugzilla.gnome.org/show_bug.cgi?id=672950

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3412>
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