Give API wide-character support, and implement it in cReddit

While normal ASCII/UTF-8 works well for the majority of the text
gathered from Reddit, Reddit does use Unicode via \u escape sequences.
This patch implements a parser for Reddit's escape sequences, and
provides wchar_t versions of body text and title text with proper
unicode characters (The normal char* still work fine, they simply now
lack the Unicode characters completely).

To implement this into cReddit, Ncurses was switched over to use
wide-character support, along with most of the cReddit internals.
locale.h and setlocale() are used to make sure the correct text encoding
setting is setup on program start.