Proper Dedicated server build scripts and itemserver bug

Two requests:

• Include scripts and instructions for building the dedicated server on Windows/Linux.
• Fix the itemserver bug nonsense on dedicated servers. Something get's fucked up with sdk_inventory data is sent from client to server so it arrives broken. Something with symbols. Likely in the engine layer.

Like how are we even supposed to properly distribute a tf2 mod when basic functionality is broken Valve? Listen Servers are not good enough.

Since the source engine is closed source, the sdk_inventory stuff is something that has to be fixed on your end. All we can do ourself is workarounds that either use improper channels or flat out bypass what the engine provides.