also write server_type enum from games.xml, avoid GAMES_TOTAL ambiguity

[illwieckz]

• also write server_type enum from games.xml

Automatically generate the server_type enum from games.xml to reduce hand-written code and avoid sneaky sorting errors

• use UNKNOWN_SERVER everytime there is GAMES_TOTAL

GAMES_TOTAL is equal to UNKNOWN_SERVER and the GAMES_TOTAL name is ambiguous because people can believe it's the amount of games including UNKNOWN_SERVER.

Using UNKNOWN_SERVER instead of GAMES_TOTAL makes explicit that a code like that is listing every games except the unknown one:

        for (i = 0; i < UNKNOWN_SERVER; i+)