AP Mk 1 Coach Pack Vacuum Brake Patch

This patch creates vacuum brake only versions of the beautiful Armstong Powerhouse Mk1 Coaches. This fixes a core Train Simulator bug where dual braked coaches have dragging brakes when being hauled by a locomotive with vacuum brakes. 

This patch duplicates coaches in the following liveries:

Blood & Custard, Blood & Custard 2, Chocolate & Cream, Chocolate & Cream 2, Maroon, Maroon 2, Green, Green 2, InterCity, InterCity White, InterCity Swallow, West Coast Railway Company