Convert to posix_spawn #17
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For some reason, this does not correctly turn on ECHO although for programs that set the term on their own (e.g., neovim), they run fine anyway
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This allows us to properly call programs, especially ones that rely on standard input. It closes #5, closes #10, and closes #15.
However, it does not correctly reset the terminal mode when executing programs, which means that standard input is not echoed to the screen. I'm not sure why this is, since I'm pretty sure I'm doing it right, but whatever.
Programs such as neovim, that handle input and output in nonstandard ways, do work correctly.