This is the first discrete notifications objects after /r/3009. This also fixes
an issue in /r/3009 where PurpleNotification was still marked as a final type.
Testing Done:
I have a WIP branch for updating the Pidgin side that I used to verify functionality but it has some issues so isn't included here.
Also ran the unit tests under valgrind.
Reviewed at https://reviews.imfreedom.org/r/3035/
# UPDATING VERSION NUMBERS FOR RELEASES
#
# The version number is:
# <major>.<minor>.<micro><extra>
#
# micro += 1
#
# If any functions have been added to libpurple, Pidgin, or Finch:
# micro = 0
# minor += 1
#
# If backwards compatibility has been broken in libpurple, Pidgin, or Finch:
# micro = 0
# minor = 0
# major += 1
# purple_soversion += 1
#
# extra should be similar to one of the following: