Reimplement useRecognizers with useMemo

[thephoenixofthevoid]

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1. Use ES6 default values syntax in config.ts
2. Define DEFAULT_SWIPE_VELOCITY and DEFAULT_SWIPE_DISTANCE (magic numbers otherwise)
3. reimplement useRecognizers using useMemo: simpler code and less hooks involved

[dbismut]

Thanks a million @thephoenixofthevoid, no one had looked into the code that deep I hope it isn't too ugly. I'm new to TypeScript and don't have any professional experience with React so there might be clumsy workarounds.

I've looked at your commits and they all look great, useRecognizer never felt right and I love the way you fixed it.

Is there any reason why you're using let vs const in config.ts? I know there's two sides on the matter, I don't have any strong opinion on it.

[thephoenixofthevoid]

Just to be consistent among functions: in one function there is a need to change value, so it's impossible to use const in that case. Anyway they all turn into "var"s in the resulting code that will actually run.

I hadn't spent much time on that file yet, trying to avoid placing too many changes into a single PR. In the end, it's safer to use const everywhere, but some refactoring needs to be done to achieve that.

[dbismut]

No worries. Can I merge the PR or do you have more commits planned at this stage?

[thephoenixofthevoid]

Yes. I will create a new PR for next changes.