Write Exercise Generator (practice & concept exercises)

[verdammelt]

The (former) common lisp concept exercise generator generates files for the exercise but not for the concepts that exercise may include.

The generator should be expanded to include a way to generate concept files.

Further it might be good if, when generating an exercise, a list of concepts can be provided which would in turn, cause those concepts to be generated if needed.

[verdammelt]

This is an old issue and the old generator was removed.

However it would be still good to have a generator. It should handle creating pracitce & concept exercises - that may mean two generators?

More thought needed/wanted.

[verdammelt]

I have created the beginnings of such a thing - it at least creates the stub files for concepts and concept exercises: #496
I'll leave this issue open and as time goes on the entire issue will be finished.

[verdammelt]

A practice exercise generator was added to the project - written in Python. I would still like to have a Common Lisp generator - one that can be used from the REPL.