Convert interfaces to types for service functions

Add SSR support by checking to render server-side or client-side.

Also made key offsets as trade-off of accuracy and pixel-perfectness.

Use compromise for metrics to produce a more aesthetic rendering.

Dedicate caches to same functions

Prefer using React memoization instead of mem when using inside React.

Add memoization to expensive pure functions because the library involves a lot of computation under the hood.

Use custom styled keys and add pressed keys for styled key set.

Refer to URL in comment for details.

Add styled keyboard made out of scalable HTML elements.

Add files generated from tsdx.