Add beginTime to emitter to fix emitter position

[rcole34]

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Issue Link :link:

• Is this a bug fix or a feature? Bug Fix
• Does it break any existing functionality? No, although it may change some existing functionality (to work how it's supposed to work)

Goals of this PR :tada:

• Why is the change important? Prevents confetti from appearing in the middle of the screen instead of at the emitter point
• What does this fix? See videos below (note in the before confetti appears elsewhere on the screen at first instead of just at the emitter point
• How far has it been tested? Enough to see that it works 🙂 . I came to this solution through the following excerpt from a NSHipster article (https://nshipster.com/caemitterlayer/): > The central problem is that Core Animation operates on its own timeline, which doesn’t always comport with our own understanding of time. > For instance, if you neglect to initialize the beginTime of the emitter layer with CACurrentMediaTime() right before it’s displayed, it’ll render with the wrong time space.

Before:

After:

How Has This Been Tested :mag:

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• User Interface Testing
• Application Testing

Test Configuration :space_invader:

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• iOS version || MacOSX version

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