#33: Add forward-declaration-only headers

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#33: Add forward-declaration-only headers
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 Reporter:  jmmv   |       Owner:  jmmv
     Type:  task   |      Status:  new 
 Priority:  minor  |   Milestone:      
Component:  MISC   |     Version:      
 Keywords:         |  
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 It would be nice to split the header files into two components: one
 providing forward declarations only and the other providing everything
 else.  This would make the implementation files clearly expose their
 dependencies by making them explicitly include all required header files.
 Also, it'd remove clutter from header files by reducing their dependency
 tree.  See, e.g. the error.h and error_fwd.h headers in atf-c.

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Ticket URL: <https://www.julipedia.org/projects/atf/trac/ticket/33>
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