Add module system #10
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Adds `car` and `cdr` for destructuring lists. Adds `empty?` to check for an empty list Starts build of terp prelude with `fold_list` and `sum` and `length` implemented in terms of `fold_list`.
Also fixes a parse error that was preventing empty lists from being valid inputs.
Will remove others in a later commit. These end up not being necessary if the terms are just parsed and tagged in one of the value parsers. Minor tweaks needed in other files that were expecting the parsed tree to be shaped slightly differently, but nothing too major.
Modeling off of Racket; `require` to import a module.
This was going to introduce `provide`, but after getting one passing test, they've all failed. Realized that there isn't a good mechanism in place with this approach to 'compile' functions that are exported from a module that may depend on a function that is private. Opting for now to make all functions public when importing. There will be namespace pollution; not sure best approach right now.
Now functions must be explicitly provided to be used when imported.
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Discovered when importing a module that only defined a single function.
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