kruland2607 48adc0b7bf Rework the AttachmentFactory and Attachments. Make the Attachment
implementations stand on their own and be able to determine the location
of their bytes without needing a reference back to the
AttachmentFactory.  This required changing the loading semantics so the
OpenRocketDocument is created prior to beginning to read the xml file. 
Added an OpenRocketDocumentFactory to facilitate construction of
OpenRocketDocument objects.
2013-01-09 21:28:53 -06:00
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