Prevent team names from having consecutive periods in them. Causes prec to fail to save demo file.

[TheRebelCreeper]

My team set our name as erm... in a match, which resulting in prec not recording a demo for anybody in the server. My only guess is because having three periods was an illegal demo file name. It would perhaps be a good feature to prevent this from happening.

[ldesgoui]

P-REC is getting deprecated