Mounted Asset Removal

[Gocnak]

We actually have a C++ tool shipping with the game that does this: "bspfix.exe"

So ideally all we need to do is invoke it on the bsp here.

[tsa96]

For clarification, we have bspfix in C++ but want to write a C# version. Rewriting the C++ exactly would require license, but the concept is simple, compare a hash of every file in the Paklump with Valve assets of corresponding file type.

We don't want to require everyone running these checks have all content downloaded, instead we'll ship a JSON file with releases.

We need:

• Functionality mentioned above of traversing the Paklump and hash checking every file against a JSON list of hashes
• To be able to generate hashes of every file in a VPK and write to JSON list

Both should be usable via CLI and UI. It's important we can hook the hash generation up to our internal CI, as well as perform the hash checks via command-line, maaaaaybe integrating into the backend eventually.

[tsa96]

See https://discord.com/channels/235111289435717633/998769771451519088/1072388945146552370 for discussion of this

[BIRD311]

Unassigned my self for now in case someone wants to pick this up. Calling bspfix on the map was implemented* but rewriting this in C# was not.