Adding keyboard support for each effect

[codingjoe]

Using a command pattern to add keyboard support for each effect.

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[minhyuk]

+1
keyboard shortcut!

when real use, when effect transition has made is important issue.
mouse click is not enough fast to these action.
especially rock band music.

and, thanks your great constribute

[codingjoe]

@minhyuk I actually added some keyboard shortcuts. 0-9 keys change the effect. The T-key triggers and the arrow keys are active in some effects too.
But there really is a consistent keyboard setup needed.