Add rule to import classes except for built-in PHP classes.#9429

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umulmrum wants to merge 2 commits intosymfony:2.7from

umulmrum:feature/coding-standards-import-classes

Commits on Mar 12, 2018

Add rule to import classes except for built-in PHP classes.
umulmrum
committed

Commits on Mar 16, 2018

Improve wording on use-statement rule.
umulmrum
committed