Initial mesh support

[thangngoc89]

Hi,

Thanks for making niivue-react! I’ve been using it for a while now, and it’s been awesome. Your diffing method is genius—way better than the way I was reacting (pun intented) to props changes in my old implementation. I ripped it out as soon as I see yours.

Recently, I needed mesh support for my project, so I put together this PR.

Right now, the support is pretty basic but gets the job done:

• Load/remove mesh
• Change mesh property (rgba255, visible, ...)
• Change niivue's instance meshXRay

I’ll add more features as I need them for my project.

Cheers

[jennydaman]

Amazing! I’ll review later today or tomorrow.

[codecov]

Codecov Report

Attention: Patch coverage is 97.26027% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.62%. Comparing base (d7734b8) to head (fe93b1f).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/NiivueMutator.ts	97.22%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
- Coverage   81.76%   79.62%   -2.14%     
==========================================
  Files           5        5              
  Lines         784      844      +60     
  Branches      153      154       +1     
==========================================
+ Hits          641      672      +31     
- Misses         50       78      +28     
- Partials       93       94       +1     

Flag	Coverage Δ
e2etests	79.62% <97.26%> (-2.14%)	⬇️
unittests	?

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[jennydaman]

Thank you so much for the contribution! I look forward to using it myself.

Would you try recreating some examples? If not, we can go ahead and merge this and I'll do that in the future.

[thangngoc89]

@jennydaman sorry for the late response. I'll find an official niivue example and add a react example for it in the next few days