rlvmisc optional

this commit removes poses as bundle and adds rlvmisc instead as an
optional feature to install; most people never need rlvmisc, it makes
sense to keep it optional not only because it is excluded from defaults;
investigated for issue #65; poses are removed because of the many
requests to have our updaters not mess with peoples custom arrangements
for poses, our own poses will be supplied inside of stock designs and
the signature collar but not part of the software/content package in the
updater