Replaces a character in a string.
Replaces the character at the specified index in the string with value `c',
handling any adjustments for variable width data (ie. if `c' encodes to a
different width than the previous value at that location). If `index' is
negative, it counts backward from the end of the string. Example:
usetat(text_string, 2, letter_a);
Returns the number of bytes by which the trailing part of the string was
moved. This is of interest only with text encoding formats where
characters have a variable length, like UTF-8.
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