`WebGLRenderer` review `on:before_render` and `on:after_render` with `mode="auto"`

[vatro]

to check / fix / polish:

• When using on:before_render={animate}: obj3d.rot = [0, rot_y, 0] will, but obj3d.rot[1] = rot_y will not schedule a new render, the value of rot will be changed in both cases though. This may be a svelte-accmod or a WebGLRenderer.render_standard() logic issue, probably the second.

I assume a problem with this line:

https://github.com/vatro/svelthree/blob/433dea2623a3620281b5f5b9fef62377c0dc235b/src/components/WebGLRenderer.svelte#L590

this hack will work with on:before_render:

  // overriding initially set value (via shorthand attribute / markup) once programmatically from inside `animate()`!
  if (e.detail.frame === 0) {
      obj3d.rot = [0,0,0]
  }
  obj3d.rot[1] = rot_y

[vatro]

this is a svelte-acmod issue. We're now default Svelte first.