[Enhancement] Modded support

[spannerman79]

Is it possible to add an env var to bypass auto updating at start?

For example;

STATIONEERS_DISABLE_AUTOUPDATE (DEFAULT: "FALSE" - Disable auto updating at start for modded servers)

The only current way to mod a server is to modify the xml files directly on the server. When an update is pushed steamcmd will reset those xml files back to default when steamcmd is used with the validate flag.