[João Valverde <joao.valverde@xxxxxxxxxxxxxxxxxx>]

Please see https://code.wireshark.org/review/#/c/23983/

    Put different types of plugins (libwiretap, libwireshark) in different
    subdirectories, give libwiretap and libwireshark init routines that
    load the plugins, and have them scan the appropriate subdirectories
    so that we don't even *try* to, for example, load libwireshark plugins
    in programs that only use libwiretap.


If anyone has any objections to this now would be a good time.