Instead of drawing this all ourselves, drop it all in a `GtkGrid`. This handles all the padding and alignment for us, which is way more consistent, too.
Note, old code has not been removed because it's used in conversations.
Testing Done:
Hover over buddy list, try with keyboard `Ctrl+F1`.
Reviewed at https://reviews.imfreedom.org/r/754/
# 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: