- openssl execution is asynchronous now as well, as it could take up som...

I've updated the script with one technical enhancement and one new feature.

1) The openssl executable now also runs via hook_process, making it run asynchronously, preventing any small hickups in the UI of weechat.

2) The ability to group messages that shortly follow each other as a single message. This is particularly handy when receiving multi-line messages via another protocol such as Jabber or a small multi-line paste via IRC. Via the normal process the messages would very likely be in the wrong order when received on my Android phone.

I've also added a debug setting to make the execution pretty verbose, in case of unexpected problems.