group notification customizations

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
add `weechat-notification-types'

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Notify on disconnect

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
call notification handlers with buffer-pointer instead of name

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
clarify customize description

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Change order of arguments to `weechat-notify'

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Rebuild the notification handlers

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>