react-spring, ordering and decoupling

[bbohlender]

fix #8, #16 should improve #7

• decouples from three.js with useBox
• integrates with react-spring enabling useSpringBox
• offers Box and SpringBox and is extensible for more Box types using useBox hooks
• intergrates odering management using index

Breaking changes:

• BoxReferenceGroup instead of Flex being the automatic reference group
• use "AutomaticBox" instead of a normal "Box" to enable automatic size computation based on bounding box of children
• Flex has no "inner" group, thus a flex element can't be translated (however a surrounding group can be of course)

I'd love to discuss the proposed changes. I've tested them using the storybook stories and already used it on a XR-UI library I am writing (https://twitter.com/BelaBohlender/status/1433844465450508288).

[v1rtl]

lint action seems to still fail

[bbohlender]

lint action seems to still fail

yeah, I am not using yarn, so the lock file had to be updated, should be all set now :)