Rewrite for v3.0.0

[Wizofgoz]

New Features

• Request Builders
• Fully objectified requests/responses
• Iterable paginated responses
• Automatic retry
• Constants for Filter Operators, Sort Directions, and Date Format
• Automated tests
• Removed vendor directory from source control
• Upped PHP requirement to 7.2
• GitHub Actions workflow
• Automated linting and static analysis tools (PHP-CS-Fixer, Phan)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@2f4d604). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #6   +/-   ##
=========================================
  Coverage          ?   57.14%           
  Complexity        ?      532           
=========================================
  Files             ?       47           
  Lines             ?     1085           
  Branches          ?        0           
=========================================
  Hits              ?      620           
  Misses            ?      465           
  Partials          ?        0           

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[Wizofgoz]

@tolson17 I flagged this as a draft to add more tests