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/
How to build Pidgin for Windows using MinGW
===========================================
For the latest build instructions, please refer to:
http://developer.pidgin.im/wiki/BuildingWinPidgin