Main reason to have this at all is to make char-by-char reading
feasible. This occurs at `stream_chunk`, and previously if we passed
in STDIN for `stream_init_file`, STDIN will only terminate once
STREAM_DEFAULT_CHUNK number of characters have been fed into the pipe.
This isn't desirable for STDIN (we really want to read char-by-char
for expressions), nor would it necessarily be desirable in network
applications. So any stream marked STREAM_TYPE_PIPE will only chunk
character-by-character rather than genuine chunks.
main.c and test.c generate binary executables so they can stay in the
main folder, but the rest can go into their own dedicated folder to
make it look nicer
