pidgin/pidgin

Convert all of the protocols to use the new protocol_manager_ api

Testing Done:
Compiled and ran locally. Verified all protocol plugins showed up and that there were no errors on shutdown.

Bugs closed: PIDGIN-17474

Reviewed at https://reviews.imfreedom.org/r/537/
subdir('libpurple')
subdir('protocols')
if ENABLE_GTK
subdir('pidgin')
else
pidgin_doc = []
endif
if enable_consoleui
subdir('finch')
else
finch_doc = []
endif
alias_target('doc', libpurple_doc, protocols_doc, pidgin_doc, finch_doc)