Refactor game mode scoring and win conditions

* Add overridable hooks for sunk/reaped ball handling and turn behavior.
* Implement default scoring and game-over messaging across game modes.
* Add pretty game mode names for win-condition messages.
* Update Free Ball, Last Ball, and Snooker modes to return win-condition messages.
* Move the reset button lookup to the scene root for multiplayer setup.
* Move camera controller scene to shared base UI. Move parts of it to new game_data UI node.
* Add commented test state generation for end-state testing.

controllers/game/modes/free_ball.gd

@@ -5,5 +5,9 @@ func  _init() -> void:
 	pass
 
 
-func process_win_condition() -> void:
-	pass
+func process_win_condition() -> String:
+	return super()
+
+	#for ball_state in ball_states.values():
+		#if ball_state["reaped"] or ball_state["sunk"]:
+			#continue