Fix memory leak and fix crash#152

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classic-chris:bug/memory_leak

Commits on Apr 4, 2019

Fix memory leak in which the keyboard was keeping a strong reference to the CardTextField as a result of bugs in overriding first responder functions.
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Commits on Apr 5, 2019

Brought back the firstResponder overrides to avoid the situation where a child text field resigns and the CardTextField itself becomes first responder. Note that the logic in becomeFirstResponder i…
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