-Feature: [NewGRF] Vehicle variable 4D for determining the position within an articulated vehicle.

git-svn-id: http://svn.openttd.org/trunk@26157 6aa0318a-3be1-0310-93fa-89fd2396df07
-Fix: NewGRF inspect window lacked several newer variables.

git-svn-id: http://svn.openttd.org/trunk@26158 6aa0318a-3be1-0310-93fa-89fd2396df07