Streamer mode

[nullsystem]

Description

• No avatar
• No names (only generic ones)

• OBS detection (Linux)
• OBS detection (Windows)
• Automatic (OBS detection) mode
• Names are "A...." like Discord streamer mode

• Won't do: Custom names

Toolchain

• Linux GCC Distro Native Arch/GCC 14

Linked Issues

• fixes Streamer Mode #150

[Rainyan]

A few suggestions:

Obfuscate console printouts

• IP address prints (your own IP & the server IP - avoid attracting DDOS attacks)
  • This could for example obfuscate the 2 middle octets as: 127.0.0.1 -> 127.*.*.1 (obviously not an issue for local addresses but just as an example)
  • Pretty sure we don't support ipv6 at engine level at all, so it's not something to worry about in this case - although I guess similar deal, but delimiting by : instead of . would work.
• Home dir prints by comparing env vars $HOME (Linux) and %HOMEPATH% (Windows) for the few prints that use these, to avoid self-doxxing ( /home/johnsmith/..., C:\Users\JohnSmith\...)
  • For example (Linux): Some printout result: /home/realname/foo -> Some printout result: $HOME/foo
  • For example (Windows): Some printout result: C:\Users\realname\foo -> Some printout result: %HOMEPATH%\foo
  • This could probably be implemented as just an unconditional string replace from the Valve V_... strings interface or similar

I imagine there's not that many places where we print the homedir to stdout, so it probably wouldn't need to be a global string replace, but rather just at those sites.

Detect OBS at game launch for cvar initial value

• Linux: for <pid> in /proc/<pid>: cat cmdline -> if equals "obs" (or ends in /obs?)
• Windows: https://learn.microsoft.com/en-us/windows/win32/psapi/enumerating-all-processes -> "obs.exe" (or whatever the app binary is called on Windows)

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Not that we have to do all of this stuff here in this PR, but this could be worth having in the future.

[nullsystem]

@Rainyan
Looks like that "enumerating all processes" WINAPI only shows the names of 32-bit processes/programs due to hl2.exe/NT;RE also only being a 32-bit program. For example in my printout, for the names I can see 32-bit programs like hammer++ and steam showing up, but 64-bit programs like OBS and Chrome not showing up.

[nullsystem]

Found a Process32Next method which actually works so gonna use that instead.