add secure area option to generator

[duncdrum]

add mysec secure area to generator options.

see #11
close #339

Future work:
see #344
see #345

[duncdrum]

note to self:

HTTP ERROR 500 javax.servlet.ServletException: javax.servlet.ServletException: An error occurred while processing request to /exist/apps/newsec/: err:XPDY0002 variable '$local:login_domain' is not set. [at line 20, column 34, source: /db/apps/newsec/controller.xql]

[line-o]

I would merge both controllers.

[duncdrum]

let me rephrase: one controller in the generated app, or one controller template to generate the app files from?

In the first case, I won't have time in the foreseeable future to redesign the mysec reference app but it's a nice improvement, PRs certainly welcome.

In the second case, I was thinking about that, but a single source template file becomes extremely complex and fragile. I sacrificed some DRYness for a comprehensible approach.

[duncdrum]

🎉 This PR is included in version 2.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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