Improving the database.txt

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Currently that file is the sole proprietor of MAP's database knowledge. This 
has the problem of having to duplicate the file between Servers cuz of Server 
ID, Server group and Server-specific connection infos, and possibly rcon pw.

To improve this, either introduce cvars which lock the particular piece of 
knowledge to that Server -if defined-, or allow the specific knowledge to be 
loaded from another file. Mind you that I haven't tried to §exec§ from the 
file cuz I'm sure it won't work.

Original issue reported on code.google.com by JouniJarvis on 24 Jul 2014 at 6:09