add support for -X cli style

[NoahTheDuke]

No description provided.

[seancorfield]

For a lot of tools, the -X invocation is pretty ugly from the command-line, and most users prefer the -M invocation.

Where the -X style invocation shines is programmatic invocation (e.g., from build.clj) but you already expose lazytest.repl/* functions for this.

My recommendation is: don't bother supporting -X at the CLI.