add rng functionality

[crflynn]

• clean up super() calls
• use inheritance in lieu of attribute where possible
• add rng control and seeding via the new random submodule

closes #24

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (refactor@7026013). Click here to learn what that means. The diff coverage is n/a.

@@             Coverage Diff              @@
##             refactor       #40   +/-   ##
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  Coverage            ?   100.00%           
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  Files               ?        42           
  Lines               ?      1379           
  Branches            ?         0           
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  Hits                ?      1379           
  Misses              ?         0           
  Partials            ?         0           

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[anntzer]

thanks :)