Property accessor custom array object fix
merged branch cystbear/PropertyAccessor-CustomArrayObject-Fix (PR #7320)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #7320).

Commits
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7ff2d52 Property accessor custom array object fix

Discussion
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Property accessor custom array object fix

Copied `Symfony\Component\Form\Tests\Fixtures\CustomArrayObject` to Fixtures dir, and used it in tests to be able run tests separately from Form component,