Add option to add victory events.

dsst/dsst_gtk3/handlers/victory_handlers.py

@@ -0,0 +1,17 @@
+from gi.repository import Gtk
+from dsst_gtk3 import dialogs, gtk_ui
+
+
+class VictoryHandlers:
+    """Callback handlers for signals related to managing victory events"""
+    def __init__(self, app: 'gtk_ui.GtkUi'):
+        self.app = app
+
+    def do_add_victory(self, *_):
+        ep_id = self.app.get_selected_episode_id()
+        if not ep_id:
+            return
+        result = dialogs.show_edit_victory_dialog(self.app.ui, ep_id)
+        if result == Gtk.ResponseType.OK:
+            self.app.reload_for_season()
+            self.app.reload_for_episode()