Add ability for shortcut action to be disabled instead of removed when unregistering

[Yoooi0]

So that we can register/unregister actions dynamically without loosing configured actions in bindings. Somehow need to be able to differentiate deprecated vs dynamic actions. Deprecate via migrations?

https://github.com/Yoooi0/MultiFunPlayer/blob/9d6a9a8d15fdd609c0f639aff3ce52e999cfad4d/MultiFunPlayer/Input/IShortcutManager.cs#L71-L79

Also plugin registered actions will be lost each restart.