Fix crash if EC_RigidBody::ShapeAABB (or deprecated GetAabbox) was called before the component was properly initialized. If ShapeAABB is called in such state, return negatively infinite AABB (same as for EC_Mesh's AABB & OBB functions).
EC_VolumeTrigger::GetEntityInsidePercent: use EC_RigidBody's ShapeAABB instead of the deprecated GetAabbox.
EC_VolumeTrigger's public slot API cleanup, mostly notably make EntitiesInside return type that is usable from script.
Further fix for EC_RigidBody::ShapeAABB crash.