Passthrough Hull Brush (#613)

This is an MVP for a passthrough brush.

It's limited at present:

Only works when the environment is set to passthrough.
Punches through non-opaque brushes even when they are nearer to the camera (is this an issue with rendering queues or something else?
Punches through all brushes further from the camera so can't be used for "portal" style effects.
I think it still adds some value and it's low-hanging fruit.

* First stab at a passthrough brush

* Flip exclude logic

* Hull passthrough tweaks

* dotnet-format

* Build complains if there's no entry for Cull

* Dummy commit to test pre-commit check

* Need to define this in every file it's used in.

* Try and nudge pre-commit into working

---------

Co-authored-by: Mike Miller <[email protected]>

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