fix handling of \ and \0 in string literals in non-Unicode mode (I broke them when adding Unicode mode)
fix handling of \ and \0 in string literals in non-Unicode mode
(I broke them when adding Unicode mode)

FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs