Script command now works ... in our simple shell

it's a pain in the ass in bash. TODO.

Need to add goimport plumbing to make it easier.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
First version of builtin.

The way this will work:
copy /src/cmds/sh to /tmp
put the builtin file there (yes, you can override an existing one)
build into /bin/whatever
exec it.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Works for fragments, e.g.

./script 'func main() {fmt.Print("hi")}'

produces code that compiles.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
A reasonable compromise for now

Put the main in {}, and if you need more, add them as functions.

Fixes imports, prepends 'func main()'

Signed-off-by: Ron Minnich <rminnich@gmail.com>
formatted.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>