Implemented Event.prototype.setOnce()
Implemented Event.prototype.setOnce()

AndreyTepaykin/Platform,AndreyTepaykin/Platform,jkokh/Platform,AndreyTepaykin/Platform,jkokh/Platform,jkokh/Platform,EGreg/Platform,EGreg/Platform,Qbix/Platform,AndreyTepaykin/Platform,Qbix/Platform,EGreg/Platform,Qbix/Platform,EGreg/Platform,jkokh/Platform,Qbix/Platform