Use a different-colored favicon in development mode

src/pretix/base/context.py

@@ -0,0 +1,13 @@
+import sys
+
+from django.conf import settings
+
+
+def contextprocessor(request):
+    ctx = {}
+    if settings.DEBUG and 'runserver' not in sys.argv:
+        ctx['debug_warning'] = True
+    elif 'runserver' in sys.argv:
+        ctx['development_warning'] = True
+
+    return ctx