pidgin/pidgin

Pull the purple_markup_* api out of util.[ch] to purplemarkup.[ch]. No code was changed just moved it from one file to the other.

Testing Done:
Compile and unit tests.

Reviewed at https://reviews.imfreedom.org/r/171/
libpurple/data/purple-url-handler.desktop.in
libpurple/protocols/null/nullprpl.c
pidgin/data/im.pidgin.Pidgin.desktop.in
sub/libpurple/data/purple-url-handler.desktop.in
sub/libpurple/protocols/null/nullprpl.c
sub/pidgin/data/im.pidgin.Pidgin.desktop.in