Add Composer Dependency Analyser + Remove #[Override] and ext-mbstring

[vjik]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.51%. Comparing base (f298378) to head (f271ce4).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #68 +/- ##
=========================================
Coverage 95.51% 95.51% Complexity 100 100 =========================================
Files 24 24 Lines 290 290 =========================================
Hits 277 277 Misses 13 13 

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