Migrate CLI to Clikt

[tagantroy]

Is your feature request related to a problem? Please describe.
Looks like https://github.com/xenomachina/kotlin-argparser is not actively maintained. Only two commits since 18 Aug 2018.

Describe the solution you'd like
Migrate to https://github.com/ajalt/clikt/
Clikt provides more features and better supported

Describe alternatives you've considered
https://github.com/Kotlin/kotlinx-cli is another option, but situation is similar to https://github.com/xenomachina/kotlin-argparser