fix: shaderMaterial uniforms are shared between instances

[emmelleppi]

What

adds the clone of uniforms, preventing the use of the same instance
Resolves #190

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/pmndrs/drei/mgos49b06
✅ Preview: https://drei-git-shadermaterial-multiple-instances-fix.pmndrs.vercel.app

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit ae58bb3:

Sandbox	Source
green-paper-skzxl	Configuration
drei reflector	Configuration
objective-kare-9jp0u	Issue #190

[joshuaellis]

Thanks, @emmelleppi!

LGTM, @drcmda be good to get your 👍🏼 before merge.

[emmelleppi]

Here a cbs with the deploy

https://codesandbox.io/s/nice-wood-o89f1?file=/src/index.js

[github-actions]

🎉 This PR is included in version 3.3.0-beta.1 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 3.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀