Support Directory.Build.targets parsing and getting Target nodes

[FrediKats]

Close #33

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 93.27%. Comparing base (0c37c7d) to head (a8705ca).

❗ Current head a8705ca differs from pull request most recent head 08e59cc. Consider uploading reports for the commit 08e59cc to get more accurate results

Files	Patch %	Lines
...ProjectSystem/Projects/DirectoryBuildTargetFile.cs	45.00%	10 Missing and 1 partial ⚠️
...tem/SolutionModification/DotnetSolutionModifier.cs	42.85%	2 Missing and 2 partials ⚠️
...utionModification/DotnetSolutionModifierFactory.cs	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage   95.14%   93.27%   -1.88%     
==========================================
  Files          28       29       +1     
  Lines         700      743      +43     
  Branches       80       85       +5     
==========================================
+ Hits          666      693      +27     
- Misses         20       32      +12     
- Partials       14       18       +4     

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