Initial add of an NSIS installer script for the plugin pack. I just cheated and
ripped this off from Guifications 2.x. This needs substantial amounts of work
before it's release/distribution ready.
#
# pidgin_major_ver and pidgin_minor_ver should be defined to match the minimum
# Pidgin API version _required_ to build Plugin Pack
# Due to the way Pidgin checks plugin versions, we need to also ensure that
# the correct minimum version of Pidgin is Require:'d based on what version of