Revised: parametrize struct definitions of random matrix ensemble types

[apkille]

Revised version of #96. Parametrizes ensemble type definitions by their Dyson index β, while making some changes proposed in #91.

[codecov]

Codecov Report

Attention: Patch coverage is 40.38462% with 62 lines in your changes missing coverage. Please review.

Project coverage is 42.97%. Comparing base (37f177b) to head (d636a3b).

Files with missing lines	Patch %	Lines
src/HaarMeasure.jl	13.51%	32 Missing ⚠️
src/GaussianEnsembles.jl	59.25%	22 Missing ⚠️
src/Ginibre.jl	27.27%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
+ Coverage   42.65%   42.97%   +0.32%     
==========================================
  Files          12       12              
  Lines         830      854      +24     
==========================================
+ Hits          354      367      +13     
- Misses        476      487      +11     

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[apkille]

@dlfivefifty