Revert or edit most previous XEP plugin changes

In a single commit, because it isn’t that interesting to detail each
change.

List of reverts:

Revert "XEP-0030: allow get_info and get_items to return a coroutine"
    This reverts commit 506ca69917.

Revert "XEP-0060: wrap all iq-sending functions with coroutine_wrapper"
    This reverts commit e85fa4203e.

Revert "XEP-0163: wrap publish() with coroutine_wrapper"
    This reverts commit 69da1c1d7c.

Revert "XEP-0084: wrap functions with coroutine_wrapper"
    This reverts commit ea5615f236.

Partially revert 3d243f7 (XEP-0054) - continue wrapping functions but with future_wrapper

Partially revert 115fe95 (xep-0153) - use callbacks rather than coroutine callbacks, and propagate iqtimeouts in set_avatar.

Revert "XEP-0049: wrap functions with coroutine_wrapper"
    This reverts commit e68135f59f.

Revert "XEP-0077: wrap functions with coroutine_wrapper"
    This reverts commit 1e4944d47e.

Partially revert cd7ff685 (XEP-0199) - remove the iq.send wrapping but keep ping() as a coroutine

Revert "XEP-0257: wrap functions with coroutine_wrapper"
    This reverts commit 4da870fd19.

Revert "XEP-0092: wrap get_version() with coroutine_wrapper"
    This reverts commit 6e35948276.

Revert "XEP-0191: wrap functions with coroutine_wrapper"
    This reverts commit 6e8235544c.

Revert "XEP-0280: wrap functions with coroutine_wrapper"
    This reverts commit f795ac02e3.

Revert "XEP-0012: wrap get_last_activity() with coroutine_wrapper"
    This reverts commit 2ee05d9616.

Revert "XEP-0202: wrap get_entity_time() with coroutine_wrapper"
    This reverts commit 6fb3ecd414.

Revert "XEP-0231: wrap get_bob() with coroutine_wrapper"
    This reverts commit 17464b10a4.

Revert "XEP-0258: wrap get_catalog() with coroutine_wrapper"
    This reverts commit 18a4978456.

Revert "XEP-0050: wrap send_command() and get_commands() with coroutine_wrapper"
    This reverts commit e034b31d6b.

Revert "XEP-0279: wrap check_ip() with coroutine_wrapper"
    This reverts commit e112e86475.

slixmpp/plugins/xep_0092/version.py

@@ -15,7 +15,6 @@ from slixmpp.xmlstream.handler import Callback
 from slixmpp.xmlstream.matcher import StanzaPath
 from slixmpp.plugins import BasePlugin
 from slixmpp.plugins.xep_0092 import Version, stanza
-from slixmpp import coroutine_wrapper
 
 
 log = logging.getLogger(__name__)
@@ -71,9 +70,7 @@ class XEP_0092(BasePlugin):
         iq['software_version']['os'] = self.os
         iq.send()
 
-    @coroutine_wrapper
-    def get_version(self, jid, ifrom=None, timeout=None, callback=None,
-                    coroutine=False):
+    def get_version(self, jid, ifrom=None, timeout=None, callback=None):
         """
         Retrieve the software version of a remote agent.
 
@@ -85,4 +82,4 @@ class XEP_0092(BasePlugin):
         iq['from'] = ifrom
         iq['type'] = 'get'
         iq['query'] = Version.namespace
-        return iq.send(timeout=timeout, callback=callback, coroutine=coroutine)
+        return iq.send(timeout=timeout, callback=callback)