Enables or disables trigger bounds.
This will give the entity a "trigger box" that extends around its bounding box by iBloatSize units in X/Y and (iBloatSize/2) in +Z (-Z remains the same).
The trigger box is world aligned and will work regardless of the object's solidity and collision group.
It will be visible as a light blue box when the ent_bbox console command is used.
Valve use trigger boxes for all pickup items. Their bloat size is 24, a surprisingly large figure.