Spawnmenu middle-click regression fixed, Infected shader fallback moved into code

Commit 4e35e7 on main fixes the spawnmenu middle mouse click regression, makes the spawnmenu survive addons that provide incomplete NPC weapon data, and replaces the shipped edited Infected materials with a fallback done in code.

Full change list:

  • Fixed Spawnmenu middle mouse click regression
  • Handle addons not providing complete data for NPC weapons, so the spawnmenu doesn't get bricked entirely
  • Fixed -force32bit trying to launch 64-bit CEF
  • Use more dynamic fallback for Infected shader: instead of shipping edited materials, it is done in code
  • Fix false positive with "Out of bounds bone in CIKContext"
  • Fixed potential npc_alyx related crashes
  • Potential fix for a crash on "that one CS:S map"
  • Update Windows symstore path