Refactor lisp functions

[vinc]

• Rename print to p and println to print
• Rename string-join to join-string (aliased to join-str)
• Use atom? instead of atom by default
• Use equal? instead of eq by default
• Use variable (aliased to var) instead of define
• Keep define shortcut (aliased to def) for define-function
• Add str, str->num, str->bin, bin->str aliases
• Add num-type, num->bin, bin->num aliases
• Add uniq, rev, and len aliases
• Add bool?, str?, sym?, num?, fun?, mac? aliases
• Use short aliases in core, doc, and examples

[vinc]

This change of keyword syntax will make the language a bit more in line with something like Ruby or JavaScript which might be easier for beginners using the OS. And the aliases make it shorter. The syntax is pretty close to the Janet language that I discovered this week!

(load "/lib/lisp/core.lsp")

(def (foobar n) (do
  (var i 1)
  (while (< i n) (do
    (if (and (= (% i 3) 0) (= (% i 5) 0))
      (print "foobar")
      (if (= (% i 3) 0)
        (print "foo")
        (if (= (% i 5) 0)
          (print "bar")
          (print i))))
    (set i (+ i 1))))))

(foobar 100)

It'd be great to add an implicit do to def and while.