Allow Detekt CLI to take an args file.

[tyvsmith]

When using Detekt in the Uber monorepo, we've run into issues with extremely long argument lists that result in "Argument list too long" exceptions in the build, for things like Classpath or source lists. We've worked around it for now by trimming down our use of absolute paths in a custom Buck genrule.

Detekt CLI should have the ability to take an args file containing this information to work with larger argument lists that exceed the shell limits.

[arturbosch]

We have just figured out that detekt supports them out of the box using JCommander! Please see the PR for examples :).

[tyvsmith]

Oh, cool, I'll take a look and see about bringing that internal this week or next.