Controller

Controller:
    .doc: """
A Control.Keyboard.Controller can be added to a Physics3D.System to add a keyboard control interface to a model.
A controller contains a set of Control.Keyboard.KeyBinding through composition. For example:

my_keyboard_controller is Control.Keyboard.Controller:
    up is KeyBinding:
        keys: ["KEY_up"]
        hold becomes Actions.Set:
            targets: [signal_interface.throttle_input]
            value becomes Real: 2.3
        release becomes Actions.Set:
            targets: hold.targets
            value becomes Real: 0.0
"""
    enabled is Bool: false