fixed various rubber floor textures being broken

unbroke shiny metal texture

added new cab cream and terracotta cab paint textures and some misc plastic textures

added new box resistor grid texture for EMDs and other engines

fixed black gritpaint being colourable

added new steel mesh texture for generic use

added silver perforated tread for well cars

added replacement for orange grid texture, grid_noconstrain

added invisible texture for general use

added new textures for MLW/BBD AAR stand