Coop with !buy, Knife, Adverts, MOTD

alServ2018 and alServ2019 are now Coop servers with a !buy system.

Knife animation and sound should work now on all L4D2 servers (at least after the next restart I hope)

I have adjusted the advertisements on all servers. Now the same messages on all servers should be shown and only one easy the remember URL is displayed to the players. So it should be easier to find the portal page where all other information is linked (Homepage, Forum, HLstatsX, SourceBans, Left4Maps2000)

We have deployed a new MOTD page to be displayed in the game. It offers links to the portal page, the HLstatsX and the SourceBans page.