[sugar] Activity versioning schema

[Benjamin M. Schwartz]

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Martin Langhoff wrote:
| After
| all, if an activity writer wants to use Klingon characters for
| versioning, hey, let them go wild!

This is actually the key point.  Currently, the versioning system is
embedded into the Glucose code itself, and our plans for handling multiple
versions would require even more code to handle more complex versioning
situations.

I'd like to pose an alternative goal, inspired by your comment: Glucose
should never attempt to parse version strings.  I believe that we can
accomplish this without sacrificing any of the user-facing behaviors that
we truly desire.  The choice of an appropriate versioning scheme may then
be left to the author.

- --Ben
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