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/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "pidgin/pidgin"
REPOSITORY_TYPE = "mercurial"
BRANCH = "release-2.x.y"
LAND_DEST_BRANCH = "release-2.x.y"
LAND_PUSH = False