[Feature Request] A modifier base for player height

[Mawntee]

This is quite literally a value I've wanted accessible for years.

I know we have the players current head y pos, but it would be nice to have a consistent and independent value that can be used to offset things.

A few example use cases would be:

• Making a tunnel of notes by offsetting their z rotation, but also being able to consistently have it close in on the players head, while still having the effect feel like it's world based. (added bonus of being able to animate the players head as well)
• "Stand up" walls that are consistent for all players instead of being ezpz for giga chads, and insta-death for short lil femboy twinks

Also, it might be nice to have two different versions of this for cases where people would have "automatic player height" enabled. Like there would be the current player height, and then possibly a version that yoinks the static start of map player height value? (Although, as I'm writing this out I think it might not be necessary considering that player movement doesn't affect this value iirc)