Integrate FidryCpuCoreCounter

[theofidry]

See theofidry/cpu-core-counter#11 for the motivations.

The code should be sensibly the same, the notable differences are:

• fixed the deprecated usage of hw.ncpu
• /proc/cpuinfo is check last
• nproc is checked first (before was not checked at all, it's considered to be more accurate and less convoluted than cpuinfo though)

I would also wait on 1.x before merging this if you're happy with it. Technically the current version is fine, I'm just looking for a round of feedback before publishing 1.0.

[Slamdunk]

Fine by me 💪

ParaTest follows PHPUnit's PHP support, so I need your package to support PHP 7.3 as well

[theofidry]

Will have to add support for PHP 7.2 for PHPStan anyway so let's do it :)

[codecov]

Codecov Report

Merging #703 (0915342) into 6.x (a096be1) will decrease coverage by 0.11%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##                6.x     #703      +/-   ##
============================================
- Coverage     99.88%   99.77%   -0.12%     
+ Complexity      622      619       -3     
============================================
  Files            31       31              
  Lines          1792     1788       -4     
============================================
- Hits           1790     1784       -6     
- Misses            2        4       +2     

Impacted Files	Coverage Δ
src/Runners/PHPUnit/Options.php	99.46% <33.33%> (-0.54%)	⬇️

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[theofidry]

Should be good now!

[Slamdunk]

Thank you @theofidry