[Implement] Naive basic EventEmitter class#18

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Commits on Jul 25, 2019

Commits on Jul 26, 2019

[Implement] Multiple Parameter Callbacks with
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Commits on Jul 30, 2019

[Fix] Veryify function type is void, obtain function parameter length
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Commits on Jul 31, 2019

[Update] experimental builtins in assemblyscript package
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