Remove dbus module

It's a shame to drop this interface, but it's becoming problematic to use with
Flatpak. We should revisit these in the future,  and plug them in
org.gnome.GTG.

ref #277

GTG/core/timer.py

@@ -25,6 +25,8 @@
 from gi.repository import GObject
 from GTG.core.logger import log
 
+from dbus.mainloop.glib import DBusGMainLoop
+
 
 class Timer(GObject.GObject):
     __signal_type__ = (GObject.SignalFlags.RUN_FIRST,
@@ -41,6 +43,7 @@ def __init__(self, config):
         self.time_changed()
 
     def connect_to_dbus(self):
+        DBusGMainLoop(set_as_default=True)
         bus = dbus.SystemBus()
         bus.add_signal_receiver(self.on_prepare_for_sleep,
                                 'PrepareForSleep',

GTG/gtk/application.py

@@ -30,7 +30,6 @@
 from GTG.gtk.plugins import PluginsDialog
 from webbrowser import open as openurl
 from GTG.core import info
-from GTG.gtk.dbus import DBusTaskWrapper
 from GTG.core import clipboard
 from GTG.core.plugins.engine import PluginEngine
 from GTG.core.plugins.api import PluginAPI
@@ -115,7 +114,6 @@ def __init__(self, debug):
 
         self.init_style()
 
-        DBusTaskWrapper(self.req, self)
 
     # --------------------------------------------------------------------------
     # INIT