kernel: "overwrite prompt" setting #8644
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adds a setting -stdlib shell_bgmsg_location (above|below) where above means output bg processes io:format above the prompt and below means output bg processes io:format on the prompt, disturbing the current line, requiring a redraw to see the whole prompt
also removing code from prim_tty which was a redundant implementation of what group does when receiving "io_request" during a get_line