feat: allow exiting a poll with ESCAPE

addons/majority_judgment/nodes/MajorityJudgmentLinearResultsControl.gd

@@ -18,6 +18,19 @@ onready var ProfilesContainer = find_node("ProfilesContainer", true)
 var provider:MajorityJudgmentAbstractJudgmentsProvider
 
 
+func _input(_event):
+	if Input.is_action_just_pressed("ui_cancel"):
+		exit_poll()
+
+
+func exit_poll():
+	# Check if we want to save or discard?
+	# …
+	# Close things up
+#	stop_providers()
+	App.go_to_main_menu()
+
+
 func get_poll() -> MajorityJudgmentPoll:
 	return poll