core, setup: huge cleaning:

- moved directories from src and frontends/src to sat and sat_frontends, which is the recommanded naming convention
- move twisted directory to root
- removed all hacks from setup.py, and added missing dependencies, it is now clean
- use https URL for website in setup.py
- removed "Environment :: X11 Applications :: GTK", as wix is deprecated and removed
- renamed sat.sh to sat and fixed its installation
- added python_requires to specify Python version needed
- replaced glib2reactor which use deprecated code by gtk3reactor

sat can now be installed directly from virtualenv without using --system-site-packages anymore \o/

twisted/plugins/sat_plugin.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+# SAT: a jabber client
+# Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from twisted.internet import defer
+if defer.Deferred.debug:
+    # if we are in debug mode, we want to use ipdb instead of pdb
+    try:
+        import ipdb
+        import pdb
+        pdb.set_trace = ipdb.set_trace
+        pdb.post_mortem = ipdb.post_mortem
+    except ImportError:
+        pass
+
+from zope.interface import implements
+from twisted.python import usage
+from twisted.plugin import IPlugin
+from twisted.application.service import IServiceMaker
+
+# XXX: We need to configure logs before any log method is used, so here is the best place.
+from sat.core.constants import Const as C
+from sat.core.i18n import _
+
+
+def initialise(options):
+    """Method to initialise global modules"""
+    from twisted.internet import gtk3reactor
+    gtk3reactor.install()
+    # XXX: We need to configure logs before any log method is used, so here is the best place.
+    from sat.core import log_config
+    log_config.satConfigure(C.LOG_BACKEND_TWISTED, C, backend_data=options)
+
+
+class Options(usage.Options):
+    optParameters = []
+
+
+class SatMaker(object):
+    implements(IServiceMaker, IPlugin)
+
+    tapname = C.APP_NAME_FILE
+    description = _(u"%s XMPP client backend") % C.APP_NAME_FULL
+    options = Options
+
+    def makeService(self, options):
+        # XXX: SAT must be imported after log configuration, because it write stuff to logs
+        initialise(options.parent)
+        from sat.core.sat_main import SAT
+        return SAT()
+
+
+serviceMaker = SatMaker()