Added a personal dashboard

src/pretix/control/signals.py

@@ -1,3 +1,5 @@
+from django.dispatch import Signal
+
 from pretix.base.signals import EventPluginSignal
 
 """
@@ -34,3 +36,16 @@ should return a list of dictionaries, where each dictionary can have the keys:
 event_dashboard_widgets = EventPluginSignal(
     providing_args=[]
 )
+
+"""
+This signal is sent out to include widgets to the personal user dashboard. Receivers
+should return a list of dictionaries, where each dictionary can have the keys:
+* content (str, containing HTML)
+* minimal width (int, widget width in 1/12ths of the page, default ist 3, can be
+  ignored on small displays)
+* priority (int, used for ordering, higher comes first, default is 1)
+* link (str, optional, if the full widget should be a link)
+"""
+user_dashboard_widgets = Signal(
+    providing_args=['user']
+)