Auto-update weechat-awareness buffer

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Redraw awareness buffer on window configuration change

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
use `delete-region' instead of `kill-region'

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