Added Lines Before Namespace Fixers

NoBlankLinesBeforeNamespaceFixer is a contrib level fixer, and OneBlankLinesBeforeNamespaceFixer is a symfony level fixer. This also includes some utils refactoring and improvements.
Same here? single blank line, while $lines = 3?

php-cs-fixer itself uses symfony level, so even this class itself should apply to this rule, i do noyt see 3 lines expecte in whitespace before namespace.

Maybe i am missing something, perhaps clarify what this means exactly?