Enhancement on compatibility to the iminuit >= 2.0

[YtihalX]

main changes

Cause the iminuit no longer supports passing arguments like error_ limit_, most of the changes are focused on converting the old way of calling iminuit to the compatible way.

• fully compatible with the previous style(can this be called as a "change" LOL)
• added preprocess function to parse the improper arguments
• added copy_state! function to copy the initial states
• partially fixed the doc build, doctest now must be disabled, cause this process somehow doesn't evaluate the LazyHelp struct thus resulting in error, and the @autodocs no longer works with the LazyHelp either

some problems

problem about parallel function

I decided to implement a parallel function based on the script I previously wrote, but due to the intrinsic properties of python and julia this is barely possible, here are the reasons:

1. Python itself doesn't provide multi threading due to the GIL, so I have to use multi process in Julia to run multiple python interpreters
2. Julia doesn't provide proper function serialization between processes, which means that I can't pass the function around to initialize a Minuit object
   so basically there is no way to encapsulate the script into a function

problem about the cost function class

The iminuit provides a class called cost function with lots of built-in functions and a better integration with the minuit class, but unfortunately, the cost functions inside it seems to use the broadcast which directly calls the function over a vector. Here the function is the probability density function used to calculate chisq, so it needs to be called inside python and it needs a dot to broadcast, that's where incompatibility comes from.