Add Swipe support for hold-to-select design

Terms

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Description

In #26, hold-to-select keys were implemented. I'm not sure if this could or should be implemented independently from a more general swipe typing feature, which could be its own issue...

The current behavior is that if you press and hold the "O" key for example, you're then forced to lift your finger to choose the key you want from the pop-up. My preferred way is to be able to keep my finger on the keyboard and then swipe to the choice I want.

Contribution

Let me know if you can relate to this, or if my typing nitpicks are unique to me :). Still no Swift knowledge but might dive in.