Revise interface

[haberdashPI]

This does the following:

• some proofreading
• renamed repository and package
• renames hash function
• added methods for Nothing, Missing and AbstractArray.
• Addwrite method that falls back to Base.write to allow further customization.

[codecov[bot]]

Codecov Report

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  Coverage        ?   95.65%           
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  Files           ?        1           
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  Hits            ?       44           
  Misses          ?        2           
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