Add Event Sources:event_sources

- Add source property in Action and EventFilter
- Change TPropContainer contructor to accept keyword arguments and set
  properties that were given
- Change every single TPropContainer subclass constructor to accept
  kwargs and pass them on to super init
- Add a "null" option for TStringProperty
Use Event Sources:
- Make the probe require a source property to install or subscribe
- Have ProbeProxy install and subscribe return a prefixed address
- Make update, uninstall and unsubsribe extract the prefix from the
  address
- Have the TutorialRunner set a source on actions/events before
  installing/subscribing instead of setting current activity on
  ProbeManager
Test Event Sources:
- Change the tests according to the new constructors and behaviors

1 files changed, 2 insertions, 3 deletions

diff --git a/addons/oncewrapper.py b/addons/oncewrapper.py
index 3f6b2d0..f263dd7 100644
--- a/addons/oncewrapper.py
+++ b/addons/oncewrapper.py
@@ -26,11 +26,10 @@ class OnceWrapper(Action):
 
     action = TAddonProperty()
 
-    def __init__(self, action):
-        Action.__init__(self)
+    def __init__(self, **kwargs):
+        super(OnceWrapper, self).__init__(**kwargs)
         self._called = False
         self._need_undo = False
-        self.action = action
 
     def do(self, **kwargs):
         """