bug#6749: Snake.el enhancements

[Stuart Hacking]

Package: emacs
Severity: wishlist
Tags: patch

I have made the following small enhancements to snake.el:

- Primarily, that apples are now, by default, placed at random in the game grid. The original behaviour can be restored by toggling a customization variable.

- Some other variables are now customizable

- Added some extra doc strings to keep Checkdoc happy.

Regards,

--smh

snake_randomize.el.diff
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