Remember the DRGTK version within `mygame`

[petros]

When we put mygame into a repository, it is by itself. No DRGTK along that in the repository.

This means, we have no way of knowing which DRGTK version we had used to write, test, and release our game.

The DRGTK version is kept in:

• VERSION.txt as a SHA
• At the top of CHANGELOG-CURR.txt as a number (for example 6.4)

I am not sure which one we should be using. I guess VERSION.txt might be safer. The problem is we can't easily associate the two if we haven't already downloaded the proper version.

So, the big question is: What's the best way to associate a DRGTK's version with a mygame repository?