SBCL-style Unicode support: one character = one Unicode codepoint.

Allow one JSCL "character" object to be a surrogate pair (length-2 JS
string).
Unicode-aware implementations of most of the Characters dictionary.
CHAR-NAME and NAME-CHAR, for ASCII names.
Character comparisons, case sensitive.
Character comparisons, case insensitive.
Add array file
Basic storage vectors operations and array construction
Unidimensional aref and aset
Move vector-push-extend to arrays.lisp
Rename arrays.lisp to array.lisp
Test file for array.lisp
Fix typo
Remove aresize
Remove AFIND
Compare strings with string= rather than equal
Use STRING instead of the internal function CHAR-TO-STRING
Fix bug in read-symbol
concatenate-two
Add make-string
Change internal format of strings