pidgin/pidgin

Move the fuzzers from libpurples/tests to libpurple/fuzzers and cleanup a bunch of little things

Testing Done:
Ran the fuzzers locally

Reviewed at https://reviews.imfreedom.org/r/782/
For information on writing a plugin for Purple, Pidgin or Finch, go
http://developer.pidgin.im and click on API. From there, see the
HOWTOs in the "Related Pages" section.
You can also generate this documentation locally by installing
doxygen and graphviz dot, then running "make docs" in the
source tree. The documentation will be in the docs/html directory.