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can use Interactive.register_command to set up a new interactive
command, which allows commands to be set up near where the
functionality they interact with is defined, e.g. the ast slicing
commands are registered in Slice.ml. Also allows help messages to be
generated in a consistent way.
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Can now use C-c C-s to start an interactive Sail process, C-c C-l to
load a file, and C-c C-q to kill the sail process. Type errors are
highlighted in the emacs buffer (like with merlin for OCaml) with a
tooltip for the type-error, as well as being displayed in the
minibuffer. Need to add a C-c C-x command like merlin to jump to the
error, and figure out how to handle multiple files nicely, as well as
hooking the save function like tuareg/merlin, but this is already
enough to make working with small examples quite a bit more pleasant.
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Work on improving the formatting and quality of error messages
When sail is invoked with sail -i, any type errors now drop the user
down to the interactive prompt, with the interactive environment being
the environment at the point the type error occurred, this means the
typechecker state can be interactively queried in the interpreter to help
diagnose type errors.
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