config files: Nimscript and Nim compiler documentation inconsistency

[slonik_az]

Thanks to the power of Nim's templates one can use cmdline options syntax in 
Nimscript files like 
    
    
    --threads:on     # expands to switch("threads", "on")
    
    
    Run

I really do not see any use for `*.cfg` files and will rely on NimScript 
`*.nims` exclusively for my own projects.\--Leo|   
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