64 characters

[skx]

Once complete this pull-request will close #64, by supporting character literals.

Character literals look like this:

• #\a -> "a"
• #\X -> "X"
• #\\n -> "\n"
• #\\r -> "\r"
• #\\t -> "\t"

No other escape sequences are supported than "\n", "\r", or "\t".

TODO:

• Improve our escape-handling
  • A hard-coded list, but errors are immediately apparent, and adding new ones is easy.
• Add test cases
• Look at which builtin-functions should be added.
  • Perform the necessary additions.
• Look at which builtin-functions should be changed.
  • Perform the necessary changes.

[skx]

Functions to be added:

• Character comparisons, as noted in Support character literals #64.
• Functions to be updated:
  • random:char should return a character, not a string.
  • chr should return a character
  • ord should operate upon either strings, or characters.
• Functions to add:
  • (explode str) -> (char1 char2 .. charN)
    • join as the inverse should work as-is

[skx]

TODO:

• Add "char<", then implement the other character functions in lisp, as we do for numbers.