🚨 Security-related features & adaptions

Added several security fixes/exploit patches known from other Call of Duty® games
Added g_banIPs dvar support (max. 63 IPs), for use with the addip, removeip and listip console commands
Added the possibility to prevent script code from reading and/or writing to cvars (protect console command)
Blocked the download of _svr_ (server-sided) .iwd files via direct server download
Blocked directory traversal possibilities via direct server download
Blocked the download of (stock) IW .iwd files via direct server download
Blocked the client console printentities command if cheats are disabled
Blocked leakage of script errors on server crash (see sv_genericServerErrorMessage dvar)
Added compile flag ENABLE_UNSAFE to toggle the availability of potentially unsafe script functions that would make it easy to harm the server with malicious mod or map scripts
Time-constant string comparison for server passwords
Fixed known issues with stock voting mechanism (g_allowVote dvar)
Fixed some bugs that resulted in server crashes, to improve server availability
Packet rate-limiting is always enabled in this fork

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