Add a procedure to check if a player or entities head is within a block

Status
Works as designed
Issue description

add a procedure that triggers if only the head of the player or certain entity or entities are within a block

this procedure would be used with a suffocation procedure to check if a player is in a custom poison gas block and start suffocating them if their head was inside it.

Issue comments

You can do this by checking if the block on the entity location + 1 is not air, which can be done with procedures.