Gets the byte index of char at position n in UTF-8 String

Property definitions

core $ CString :: char_to_byte_index
	# Gets the byte index of char at position `n` in UTF-8 String
	fun char_to_byte_index(n: Int): Int do return char_to_byte_index_cached(n, 0, 0)
lib/core/text/native.nit:176,2--177,81