Crate secular

Functions

lower_lay_char	try to return a lowercased diacritics-free version of the character.
lower_lay_string	replace every character with its lowercased diacritics-free equivalent whenever possible. By construct, the resulting string is guaranteed to have the same number of characters as the input one (it may be smaller in bytes but not larger). This function doesn't do any normalization. It's thus necessary to ensure the string is already normalized.