Added support for creating custom attributes in the parsing phase.

[siad007]

Similar to the CustomChildCreator we have now the ability to let tasks take control of their child-elements attributes aswell.

[codecov]

Codecov Report

Merging #1237 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1237      +/-   ##
============================================
+ Coverage     49.22%   49.23%   +0.01%     
- Complexity     9667     9670       +3     
============================================
  Files           489      490       +1     
  Lines         23677    23684       +7     
============================================
+ Hits          11654    11662       +8     
+ Misses        12023    12022       -1

Impacted Files	Coverage Δ	Complexity Δ
classes/phing/tasks/system/DynamicTask.php	100% <100%> (ø)	2 <2> (?)
classes/phing/IntrospectionHelper.php	67.11% <100%> (+0.45%)	85 <0> (+1)	⬆️
classes/phing/util/PathTokenizer.php	52.17% <0%> (+4.34%)	12% <0%> (ø)	⬇️

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