Unify coding style

@sjaeckel integrated clang-format with formal coding style. Run his
script and commit changes.

There are pros and cons of this commit.

Mixed coding style is a "broken window". A good single style simplifies
reading and writing code.

On the other hand, this is a big change which will lead to conflicts.

src/util.h

@@ -1,7 +1,7 @@
 /* util.h
 ** strophe XMPP client library -- various utility functions
 **
-** Copyright (C) 2005-2009 Collecta, Inc. 
+** Copyright (C) 2005-2009 Collecta, Inc.
 **
 **  This software is provided AS-IS with no warranty, either express
 **  or implied.