Refactor and documentation.

dsst/dsst_gtk3/handlers/death_handlers.py

@@ -0,0 +1,16 @@
+from dsst_gtk3 import dialogs, gtk_ui
+
+
+class DeathHandlers:
+    """Callback handlers for signals related to managing death events"""
+    def __init__(self, app: 'gtk_ui.GtkUi'):
+        self.app = app
+
+    def do_add_death(self, *_):
+        ep_id = self.app.get_selected_episode_id()
+        result = dialogs.show_edit_death_dialog(self.app.ui, ep_id)
+        if result:
+            self.app.reload_for_season()
+
+    def on_penalty_drink_changed(self, widget, path, text):
+        self.app.ui.get_object('player_penalties_store')[path][2] = text