Determines the inherent direction of a character; either LTR, RTL, or NEUTRAL.
This function is useful to categorize characters into left-to-right letters, right-to-left letters, and everything else. If full Unicode
bidirectional type of a character is needed, pango_bidi_type_for_gunichar can be used instead.
| ch | a Unicode character |
| the direction of the character. |