Q1BSP: use compatible collision detection
Q1BSP: make the player's bbox fit the player's cliphull
This is necessary for correct collision behaviour (otherwise the player's "head" can poke into ceilings).
Also sets the correct bbox on Q2BSP and disables crouching on Q1BSP.
Q1BSP: use cliphulls for collision detection
Implements #2895 (closed)
Fixes various collision problems on Q1 maps.
Edited by bones_was_here