Added preserve duplicates to PathConvert

[siad007]

Added preserveduplicates to PathConvert Task.

[codecov]

Codecov Report

Merging #969 into master will increase coverage by 0.02%.
The diff coverage is 71.42%.

@@             Coverage Diff             @@
##             master    #969      +/-   ##
===========================================
+ Coverage     44.87%   44.9%   +0.02%     
- Complexity     9921    9924       +3     
===========================================
  Files           499     499              
  Lines         24049   24053       +4     
===========================================
+ Hits          10791   10800       +9     
+ Misses        13258   13253       -5

Impacted Files	Coverage Δ	Complexity Δ
classes/phing/types/Path.php	58.04% <100%> (+4.02%)	68 <19> (+1)	⬆️
classes/phing/tasks/system/PathConvert.php	61.34% <60%> (-0.4%)	48 <2> (+2)

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