Add OneShotEffect class

[audse]

This class should do all actions in the start or finish method, and finish after one process frame.

• Update AttributeEffect → AttributeOneShotEffect
• Update TagEffect → TagOneShotEffect
• Can we unbind the tick method?

Constants

enum DispatchMode {
    START,
    FINISH
}

Properties

• dispatch_mode: DispatchMode – defines whether everything runs in the start or finish method