Standard shader compatibility improvements for WebGPU

[mvaligursky]

• 2d texture sampling is using texture2DBias instead of texture2D to allow macro replacement for WebGPU
• Uniform buffer handles additional uniform types - alignment, setup
• adding extensions earlier in the shader code to avoid warnings

[willeastcott]

This seems to touch a lot of front end chunks. Are we concerned this is going to break a lot of projects that override chunks?

[mvaligursky]

This seems to touch a lot of front end chunks. Are we concerned this is going to break a lot of projects that override chunks?

I'm not, old chunks still work, just on WebGPU if they use the bias.

[willeastcott]

Please get 1 more approval on this one... 😄

[GSterbrant]

I would probably move the chunk changes to another PR just to keep them separate, seeing as they take up the majority of the changes in this PR.

[mvaligursky]

I would probably move the chunk changes to another PR just to keep them separate, seeing as they take up the majority of the changes in this PR.

It's painful to split PRs where lots of little things change to get shader compilation moving, I'm not sure its worth it.