Failsafe outline generator added. Some board files do not reliably provide a board outline which will make for unusual rendering of boards.
Failsafe outline generator added.
Some board files do not reliably provide a board outline
which will make for unusual rendering of boards.

Previously this code was present in specific file format
importing code but would prefer to see it in a single
location given that future formats may have similar issues.

chloridite/OpenBoardView,chloridite/OpenBoardView