Material reading fixes
Fix engine.CloseServer falsely claiming the server is shutting down
Update file.Read blocklist
* So it doesn't affect file and folder names in DATA path
Added 9 new combine related props from licensee repo
* Adjusted combine_booth_tall01b.vmt to be less extremely glossy
* Preview: https://files.facepunch.com/rubat/2026/October08-3304-MeanIrishsetter.jpg
Fixed missing material on that one CS:S prop and EP1 prop