fixed incorrectly named VMT

added missing VTFs for new tread textures

added new tread_diamond texture set, tread_x texture set

added acrylic_white_anticlimber for future use

changed all step tread textures to $alphatest

hot patched in acrylic_deck

Added mesh_chickenwire, horncover materials

fixed metal_shiny properly

swapped metal_shiny to use aluminum vmt as temporary fix

fixed wheel texture having broken cubemap