Use jsxc instead of commoner

Noticed several bug reports in the past few days on IRC. Still think commoner is the wrong tool for this job and jsxc is the right one.

Test plan: tested jsxc using the normal test plan. Ran bin/jsx, behaved same as jsxc
I'm guessing this was a bit more RFC than final product, but let's make sure if we do this we get parity, namely `--strip-types` and `--source-map-inline`