Added support for array_filter w/o second arg, dumping of thread objects as-is.
Updated DONE+TODO to account for hnet/ repo.
Added simple coroutine reactor pattern implementation.
Ohops, that filter 'fix' was not exactly a success (broke zillion things). Addressed.
Added testcase for the new truish filter.
Added working testcase for UDP sendto/receivefrom - that's where scr will be first used, most likely.