[vhdl-200x-ft] First cut at FT16 context declarations

Folks,

At the VHDL-200x-FT meeting last week, I took an action item to look at
specifying context declarations. Please find a first cut attached. Looking
forward to your comments.

Cheers,

PA

--
Dr. Peter J. Ashenden                        peter@ashenden.com.au
Ashenden Designs Pty. Ltd.                   www.ashenden.com.au
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