CAY-1522 EJBQL query don't support quotes

preliminary refactoring to fold in quote/no-quote detection inside the strategy
(same idea as Ilya's patches, only alos folding QuotingSupport into QuotingStrategy)

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1449462 13f79535-47bb-0310-9956-ffa450edef68