Make generated code compliant to static analyzers (tslint)

[cyrilgandon]

Running tslint against generated typescript is going to yield erros:

• replace var with let

no-var-keyword disallows usage of the var keyword, use let or const instead.

• remove trailing , in controller's config call to api

trailing-comma enforces or disallows trailing comma within array and object literals, destructuring assignment

• stop using modules for internal modules, use namespace instead as explains here

no-internal-module disallows internal module (use namespace instead).