add custom-easing & tweens, better docs, and simplify package exports

[okikio]

@okikio/animate

feature(@okikio/animate): ✨ add custom-easing & tweens

add custom-easing with support for complex easing functions like spring, elastic, and bounce;
the CustomEasing, SpringEasing, and ApplyCustomEasing functions generate Array's that emulate custom easing;
add out-in as an extra supported easing variation for custom-easing alone;

add support for ordered transform functions as CSS properties, so, the resulting transform depends on the order you define the transform functions;

add DestroyableAnimate, a extended variant of the Animate class, that removes all targets from the DOM when it is stopped via the stop() method;

add tween() & tweenAttr() for animating empty elements that are forced on to the DOM, which are removed when the animation is stopped;
tweenAttr uses the "update" event together with an opacity animation of a hidden empty element to animate attributes and styles;

update docs with detailed info.;
add Effects section to docs;
add composite to Animation Options;
add docs on running, testing, & building locally;
add badges to docs;
update API docs;

Go through the @okikio/animate README.md for more details

@okikio/native

refactor(@okikio/native): 🎨 remove @okikio/animate

remove all exported native initiative packages, including animate, emitter, & manager;
clean up code;
add badges to docs;
add more detail to docs;
update polyfill requirements;
add info. for running, building, & testing locally;
update API docs;

@okikio/emitter

docs(@okikio/emitter): 📝 better docs on local setup

add badges; add docs for installing, testing, and building locally,
update API docs;

@okiko/manager

docs(@okiko/manager): 📝 better docs on local setup

add badges, add docs for installing, testing, and building locally,
update API docs

[gitpod-io]