Also use sed to remove now unneeded Vim lines, 2to3 -f ws_comma to fix
some whitespace, and fix some other madness manually.

also use 2to3 -f ws_comma to fix some whitespace

holy diff batman!

encrypt and decrypt GPG messages in a thread, and call a callback when it's finished (sending a message is now asyncronous). Fixes #4445

Introduce a get_instance factory method for all plugins and other xmpp related classes. This will help us to decouple plugs in order to make them testable.

Corrected return values of zeroconf client in order to return true-evaluable values. related to #4051

we have that in all files. To at least lesser the confusion a bit, add
vim tags for that.
Additionally, fix wrong #! in a few files.