Fixed phing test execution under PHPUnit 8

[siad007]

Related to #1021

• rewrite of the travis build file for composer prefer-lowest
• PHP 7.1 tests with PHPUnit 7.x
• PHP > 7.1 tests with PHPUnit 8
• PHP 7.3 builds are now mandatory
• Added a code analysis stage to travis to check against phpcs
• Fixed all phpcs errors

[codecov]

Codecov Report

Merging #1024 into master will decrease coverage by 0.35%.
The diff coverage is 46.15%.

@@             Coverage Diff              @@
##             master    #1024      +/-   ##
============================================
- Coverage     45.82%   45.47%   -0.36%     
- Complexity     9970    10029      +59     
============================================
  Files           504      505       +1     
  Lines         24116    24180      +64     
============================================
- Hits          11052    10995      -57     
- Misses        13064    13185     +121

Impacted Files	Coverage Δ	Complexity Δ
classes/phing/tasks/ext/phpunit/PHPUnitTask.php	41.7% <100%> (-0.38%)	101 <0> (+2)
...ses/phing/tasks/ext/phpunit/PHPUnitTestRunner8.php	45.21% <45.21%> (ø)	57 <57> (?)
...ses/phing/tasks/ext/phpunit/PHPUnitTestRunner7.php	0% <0%> (-58.12%)	57% <0%> (ø)
...sses/phing/tasks/system/condition/AndCondition.php	83.33% <0%> (-16.67%)	3% <0%> (ø)
classes/phing/system/io/FileParserFactory.php	75% <0%> (-6.82%)	4% <0%> (ø)
classes/phing/tasks/system/MoveTask.php	65.3% <0%> (-4.09%)	40% <0%> (ø)
classes/phing/filters/ReplaceRegexp.php	92.3% <0%> (-3.85%)	8% <0%> (ø)
classes/phing/tasks/system/AppendTask.php	77.63% <0%> (-1.99%)	79% <0%> (ø)
classes/phing/tasks/system/DeleteTask.php	56.8% <0%> (-1.61%)	68% <0%> (ø)
classes/phing/util/SourceFileScanner.php	62.31% <0%> (-1.45%)	21% <0%> (ø)
... and 27 more

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[codecov]

Codecov Report

Merging #1024 into master will decrease coverage by 0.23%.
The diff coverage is 28.99%.

@@             Coverage Diff              @@
##             master    #1024      +/-   ##
============================================
- Coverage     45.82%   45.59%   -0.24%     
- Complexity     9970    10029      +59     
============================================
  Files           504      505       +1     
  Lines         24116    24460     +344     
============================================
+ Hits          11052    11152     +100     
- Misses        13064    13308     +244

Impacted Files	Coverage Δ	Complexity Δ
...g/tasks/ext/PhpCodeSnifferTaskFormatterElement.php	70.58% <ø> (ø)	10 <0> (?)
classes/phing/tasks/ext/pdo/PDOQuerySplitter.php	100% <ø> (ø)	1 <0> (ø)	⬇️
classes/phing/listener/statistics/SeriesTimer.php	0% <ø> (ø)	6 <0> (ø)	⬇️
classes/phing/mappers/CutDirsMapper.php	92.85% <ø> (ø)	7 <0> (ø)	⬇️
classes/phing/tasks/ext/git/GitDescribeTask.php	65.33% <ø> (ø)	32 <0> (ø)	⬇️
classes/phing/tasks/ext/PearPkgRole.php	0% <ø> (ø)	4 <0> (ø)	⬇️
classes/phing/listener/SilentLogger.php	0% <ø> (ø)	7 <0> (ø)	⬇️
classes/phing/BuildEvent.php	84.37% <ø> (ø)	12 <0> (ø)	⬇️
classes/phing/tasks/ext/PearPkgMappingElement.php	0% <ø> (ø)	8 <0> (ø)	⬇️
classes/phing/mappers/ChainedMapper.php	100% <ø> (ø)	6 <0> (ø)	⬇️
... and 418 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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