apache / struts / 2562

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fix double evaluations

* fixes `ComponentUtils.containsExpression` method, consequently `Component.recursion` method removed
* fixes and improves `OgnlTextParser.evaluate` method
** makes it safe from order of `openChars`
** adds support of nested expressions
** escapes middle in last loop
** removes not needed `if` conditions
* fixes current double evaluation test of `UIBean.evaluateNameValue`
* adds test that verifies double evaluation still is possible via nested variables if user really wants
* adjusts tests to the new policy - a translated variable isn't allowed to introduce new variables

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