add `weechat-narrow-to-line'

Signed-off-by: Moritz Ulrich <ulrich.moritz@googlemail.com>
add `weechat-line-add-properties'

Signed-off-by: Moritz Ulrich <ulrich.moritz@googlemail.com>
add `weechat-line-date'

Signed-off-by: Moritz Ulrich <ulrich.moritz@googlemail.com>
make sure to run the `weechat-insert-modify-hook' after everything else

Signed-off-by: Moritz Ulrich <ulrich.moritz@googlemail.com>
Don't log url to buffer twice

Signed-off-by: Moritz Ulrich <ulrich.moritz@googlemail.com>