steamcmd support

[mastercoms]

instructions: https://partner.steamgames.com/doc/sdk/uploading#3

code:

• https://github.com/ProjectBorealis/PBSync/blob/main/pbpy/pbdispatch.py
• https://github.com/ProjectBorealis/PBSync/blob/main/pbpy/pbbutler.py
• https://github.com/ProjectBorealis/PBSync/blob/main/pbpy/pbsteamcmd.py
• https://github.com/ProjectBorealis/PBSync/blob/main/pbsync/__main__.py#L516

[mastercoms]

Working well