Move from PhingFile to SplFileObject - part 1

[siad007]

• removed unused methods
• moved some general PhingFile stuff to the FileUtils
• started to use SplFileObject (part 1)

[codecov]

Codecov Report

Merging #1178 into master will increase coverage by 0.24%.
The diff coverage is 62.9%.

@@             Coverage Diff              @@
##             master    #1178      +/-   ##
============================================
+ Coverage     47.13%   47.37%   +0.24%     
+ Complexity     9971     9939      -32     
============================================
  Files           505      505              
  Lines         24484    24414      -70     
============================================
+ Hits          11540    11567      +27     
+ Misses        12944    12847      -97

Impacted Files	Coverage Δ	Complexity Δ
classes/phing/system/io/WindowsFileSystem.php	3.8% <ø> (+0.34%)	106 <0> (-10)	⬇️
classes/phing/system/io/UnixFileSystem.php	82.22% <ø> (+11.06%)	44 <0> (-7)	⬇️
...phing/tasks/ext/zendguard/ZendGuardLicenseTask.php	0% <0%> (ø)	55 <0> (ø)	⬇️
classes/phing/parser/ExpatParser.php	80.64% <0%> (ø)	9 <0> (+1)	⬆️
classes/phing/tasks/ext/WikiPublishTask.php	48.71% <0%> (ø)	52 <0> (ø)	⬇️
classes/phing/Diagnostics.php	0% <0%> (ø)	20 <0> (ø)	⬇️
classes/phing/tasks/ext/property/PathToFileSet.php	0% <0%> (ø)	18 <0> (ø)	⬇️
classes/phing/tasks/ext/RSTTask.php	99.18% <100%> (ø)	38 <0> (ø)	⬇️
classes/phing/mappers/CutDirsMapper.php	92.85% <100%> (ø)	7 <0> (ø)	⬇️
classes/phing/util/DirectoryScanner.php	73.33% <100%> (ø)	101 <0> (ø)	⬇️
... and 10 more

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