Parse namespace again instead of using nikic/php-parser

[simPod]

Performance is much better this way

This reverts commit 14bb815

[codecov-commenter]

Codecov Report

Merging #26 (fd57858) into master (521d25b) will not change coverage.
The diff coverage is 83.33%.

❗ Current head fd57858 differs from pull request most recent head 521d25b. Consider uploading reports for the commit 521d25b to get more accurate results

@@           Coverage Diff           @@
##           master      #26   +/-   ##
=======================================
  Coverage   84.44%   84.44%           
=======================================
  Files           2        2           
  Lines          45       45           
=======================================
  Hits           38       38           
  Misses          7        7           

Impacted Files	Coverage Δ
src/ClassExtractor.php	88.88% <83.33%> (ø)

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