pidgin/pidgin

Port the pidgin plugins from purple_protocols_ to purple_protocol_manager_

Testing Done:
Compiled and verified both plugins still work.

Bugs closed: PIDGIN-17471

Reviewed at https://reviews.imfreedom.org/r/530/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
subprojects/*/
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?
po\/pidgin\.pot$