Added new cvars "sv_invalid_length" and "sv_msg_badread"

[mlibre2]

Fix bug to fake players -> sv_invalid_length

Disable message flooding in console -> sv_msg_badread

[RauliTop]

Add reauthcheck to your server, and forget about this issue

[mlibre2]

Yes indeed it is, but the idea is to allow them to connect, reauthcheck already prevents it since before this update, so added cvar to enable or disable this for whoever wants or doesn't allow these types of fake players to access to the server.