Split htsn-common out of htsn and bump

I have another package I'm working on that needs some functions from htsn, so I created htsn-common. The dep on that replaces transformers and ansi-terminal.

The tasty dep I bumped to the latest since the API change didn't affect me.

I added PID directory creation to the new version of htsn so that's been removed from its ebuild.