[CssSelector] fully rewritted component

Squashed commits:
[CssSelector] removed previous implementation
[CssSelector] rewriting, step 1
[CssSelector] rewriting, step 2
[CssSelector] rewriting, step 3
[CssSelector] rewriting, step 4
[CssSelector] rewriting, step 5
[CssSelector] rewriting, step 6
[CssSelector] fixed shortcuts regex
[CssSelector] tests, step1
[CssSelector] tests, step2
[CssSelector] tests, step3
[CssSelector] tests, step4
[CssSelector] fixed problems based @stof's on feedback
[CssSelector] tests, step5
[CssSelector] tests, step6
[CssSelector] tests, step7
[CssSelector] added my name in composer.json
[CssSelector] removed unneeded use statements
[CssSelector] removed obsolete file
[CssSelector] fixed BC break