Feature Request: enum: relax or remove order requirements.

[planetis]

I think the reason behind that unordered enums trigger a compiler error is that 
would break (or make unintuitive and error prone) the simple case of not 
declaring the values of enums:
    
    
    type
      unordered_enum = enum
        a = 1
        b = 0
        c, # now what? is it 1 or 2?
    
    
    Run

As for wrapping C libraries, I know I have dealt with it in many times, just 
declare a Table[int, string] and sort it before writing the nim definitions.