Detach STDOUT/ERR from Terminal On SIGINT

[nixpulvis]

I find it very irritating to "kill" (really sending SIGINT thanks to ctrl-c) a process, only to have it's output spewed in my face at a later time. Ideally oursh will have a way to capture output of many processes at once anyway, and multiplex them in some interface. Who knows! But at that time, we should really fix this UX issue with shells.