pidgin/pidgin

Add documentation for all PURPLE_TYPE_ functions as well as PURPLE_TUNE_ constants

Add document for all PURPLE_TYPE_ defines as well as PURPLE_TUNE_ constants

Testing Done:
Compile and doc build.

Reviewed at https://reviews.imfreedom.org/r/92/
---
name: libpurple-common
buildsystem: simple
build-commands:
- true
modules:
- external/avahi.yml
- external/cyrus-sasl2.yml
- external/farstream.yml
- external/libgadu.yml
- external/libidn.yml
- external/mercurial.yml
- gplugin.yml