Update Event to allow arbitrary keyword arguments

Comments are on the same line as the possibly-failing line; if it fails,
the traceback will include that line (so it will be obvious what the
error is without looking at the source).

src/events.py

@@ -15,18 +15,22 @@ def remove_listener(event, callback, priority = 5):
         EVENT_CALLBACKS[event].remove((priority, callback))
 
 class Event:
-    def __init__(self, name, data, **kwargs):
+    def __init__(*args, **kwargs):
+        # We do this so that e.g. 'data' can be given as a param
+        self, name, data = args # If this raises, there are too few/many args
+
         self.stop_processing = False
         self.prevent_default = False
         self.name = name
         self.data = data
         self.params = SimpleNamespace(**kwargs)
 
-    def dispatch(self, *args, **kwargs):
+    def dispatch(*args, **kwargs):
+        self = args[0] # If this fails, you forgot to do Event(stuff) first
         self.stop_processing = False
         self.prevent_default = False
         for item in list(EVENT_CALLBACKS[self.name]):
-            item[1](self, *args, **kwargs)
+            item[1](*args, **kwargs)
             if self.stop_processing:
                 break