Pre SIP: scala-cli as new scala command

A couple of years ago, in that past life, I had routine tasks that I trusted only to

scala the-thing.jar some-arg

Also, recently a user wanted classes named Con and Aux on Windows, which is benign under

-d the-thing.jar

I hope the tool remains open to less-fancy use cases.

Another evocative idea for naming is clima, which suggests both cli and ecosystem.