Release v0.2.0
Rework all runners. Now, the choice is between:
isolate: The target script runs in a separate PHP process frompogo. This type of usage has one generally-good implementation (PrependRunner) based onphp -d auto_prepend_file=....local: The target script runs in the same PHP process aspogo. This has two implementations (RequireRunnerandEvalRunner), which differ in quality of support for backtraces/debugging/shebangs.