Add option to generate examples and testing project

[TimvdLippe]

The Eclipse can automatically generate modules for the language, languages examples and language tests. The IntelliJ should support this too.

I tried to do this:

Generate a project.

I expected this to happen:

An option is available to also generate the example and testing project.

Instead, this happened:

Only one project can be generated, which is just the language.

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Spoofax: