Added posix permission selector

[siad007]

POSIX permission selector based on fileperms() with permission mode octal (i.e. 750) or with a string (i.e. 'rwxrwxrwx').

[codecov]

Codecov Report

Merging #1209 into master will increase coverage by 0.04%.
The diff coverage is 81.25%.

@@             Coverage Diff              @@
##             master    #1209      +/-   ##
============================================
+ Coverage     47.39%   47.43%   +0.04%     
- Complexity     9964     9973       +9     
============================================
  Files           506      507       +1     
  Lines         24485    24515      +30     
============================================
+ Hits          11604    11629      +25     
- Misses        12881    12886       +5

Impacted Files	Coverage Δ	Complexity Δ
...ses/phing/tasks/ext/phpunit/PHPUnitTestRunner8.php	0% <0%> (ø)	58 <0> (ø)	⬇️
classes/phing/types/selectors/SelectorAware.php	28.07% <0%> (-1.03%)	28 <1> (+1)
...ses/phing/tasks/ext/phpunit/PHPUnitTestRunner7.php	58.82% <100%> (+0.7%)	58 <0> (+1)	⬆️
...phing/types/selectors/PosixPermissionsSelector.php	92% <92%> (ø)	7 <7> (?)

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