Strings
LIT -- Write a LIT entry. You're expected to write
actual string to HERE right afterwards.
LIT< x -- Read following word and write to HERE as a
string literal.
LITS a -- Write word at addr a as a atring literal.
S= a1 a2 -- f Compare strings a1 and a2, return true if equal
SCPY a -- Copy string at addr a into HERE.
SLEN a -- n Push length of str at a.
