Switch camera keep transform

[davepagurek]

Resolves #7056 (but don't merge this until after #6761 is merged!)

Changes

This branches off of #6761, which is ready to merge, but will be merged after our final docs release today so that we have time to beta test more thoroughly before doing a release. In the mean time, the actual diff can be seen here: deveshidwivedi/p5.js@model-view...davepagurek:p5.js:switch-camera-keep-transform

But to summarize:

• setCamera updates the view matrix in addition to the projection matrix
• camera() no longer resets the model matrix, just the view matrix

Now, a resetMatrix() is no longer required after using setCamera in a framebuffer's begin/end: https://editor.p5js.org/davepagurek/sketches/k71F1YPDp

PR Checklist

• npm run lint passes
• [Inline documentation] is included / updated
• [Unit tests] are included / updated

[Qianqianye]

Since #6761 is merged, are we ready to merge this one @davepagurek? Thanks!

[davepagurek]

this is good to go now too, yep!