Required some special treatment to get words (substring) out of an
input Unicode string to a utf8 one. This saves the trouble converting
the whole string: you input an offset in the Eina_Unicode array, and
provide the required length. That's is, now you can extract words and
whatnot in utf8 form.
To save code I wrapped the original one to get the whole length.
in looking at CID 1230994 i noticed that eina_unicode_unicode_to_utf8
and eina_unicode_utf8_to_unicode are really dumb. they calloc an array
of bytes then proceed to fill them all in anyway. why? also the
realloc handing in eina_unicode_unicode_to_utf8 wasn't strictly corect
and could leak memory. so this just fixes silly slow code and a leak.