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/sasl.h

@@ -1,7 +1,7 @@
 /* sasl.h
 ** strophe XMPP client library -- SASL authentication helpers
-** 
-** 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.
@@ -21,10 +21,14 @@
 /** low-level sasl routines */
 
 char *sasl_plain(xmpp_ctx_t *ctx, const char *authid, const char *password);
-char *sasl_digest_md5(xmpp_ctx_t *ctx, const char *challenge,
-		      const char *jid, const char *password);
-char *sasl_scram_sha1(xmpp_ctx_t *ctx, const char *challenge,
-                      const char *first_bare, const char *jid,
+char *sasl_digest_md5(xmpp_ctx_t *ctx,
+                      const char *challenge,
+                      const char *jid,
+                      const char *password);
+char *sasl_scram_sha1(xmpp_ctx_t *ctx,
+                      const char *challenge,
+                      const char *first_bare,
+                      const char *jid,
                       const char *password);
 
 #endif /* _LIBXMPP_SASL_H__ */