Add missing param bindings

[carbotaniuman]

This is a non-exhaustive list, but from what I've found these are the ones that are missing. This will likely also require us to rewrite param handling to handle other attributes of a node rather than just position.

• zSort - currently parsed but not applied
• alphaThreshold
• tint.{r,g,b}
• screenTint.{r,g,b}
• emissionStrength - probably blocked on advanced rendering
• opacity