Fix iOS stuttering (Round 2)

[crookedneighbor]

We extracted the bulk of the Restricted Input logic into strategies.

The iOS strategy inherits from the default strategy and just has different behavior for attaching listeners.

The Android Chrome strategy inherits from the default strategy. The only addition is that it prevents the default event when pasting. Couldn't reproduce the pasting bug in Android Chrome, so we're removing the Android Chrome strategy logic until we can actually reproduce the bug.

We've re-enabled integration testing for iOS Safari, Android 4.4 and Android latest.

Manual Browser Testing

• [x] iOS 10 Safari
• [x] iOS 9 Safari
• [x] iOS 9 Chrome
• [x] iOS 9 Firefox
• [x] iOS 8 Safari
• [x] Android 4.4 Default Browser with Default Keyboard
• [x] Android 4.4 Chrome Browser with Default Keyboard
• [x] Android 4.4 Firefox with Default Keyboard
• [x] Android 4.4 Default Browser with Google Keyboard
• [x] Android 4.4 Chrome Browser with Google Keyboard
• [x] Android 4.4 Firefox with Google Keyboard
• [x] Android 6.6 Default/Chrome Browser
• [x] Android 7.0 Default/Chrome Browser
• [x] Android 7.0 Firefox Browser
• [x] IE9
• [x] IE10
• [x] IE11
• [x] Edge
• [x] Mac Chrome
• [x] Mac Safari
• [x] Mac Firefox
• [x] Mac Firefox 17
• [x] Mac Opera
• [x] Windows 10 Chrome
• [x] Windows 10 Firefox
• [x] Windows 10 Opera

  Tests

• [x] Unit tests
• [x] Integration tests

[EvanHahn]

Other than my comments, I am 👍 assuming browser testing goes well. Happy to help with that if needed.

[crookedneighbor]

I'm :+1: on calling it BaseStrategy

[lilaconlee]

Looks 🐈 to me, but I have relatively little context on formatting.

[crookedneighbor]

@mrak I think I addressed all your comments, but let me know if there is still something pending.

[mrak]

👍

[EvanHahn]

🎉🎉🎉