pidgin/pidgin

phase2 of pidgin.h: move existing file to pidgincore.h

2020-07-23, Gary Kramlich
6941fece679b
phase2 of pidgin.h: move existing file to pidgincore.h

Rename pidgin.h to pidgincore.h and update everything accordingly.

Testing Done:
Compile test only.

Reviewed at https://reviews.imfreedom.org/r/43/
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