5a. Activating modes based on shots

How do I add modes to play based on other shots and not just ball/game start.
(a/k/a when to use AdvancedMode.Manual).

1) Make sure the mode_type is AdvancedMode.Manual as shown below:

2) Be sure to remember the name of the variable/reference that
holds the mode as defined in T2Game.py.

In the example above, this is self.my_mode so the Game instance
has a field called my_mode; we can refer to it in Mode code via:
self.game.my_mode

3) In Mode code, you can refer to the
list of currently active modes (which lives in the game) as:
self.game.modes

So, to activate/start your new mode ( MyCustomMode) based on a specific
switch or event in a different mode, in that switch/event handler you would add:

3) To conclude that mode from:
3a) a different mode:

3b) Within MyCustomMode itself: