CAY-1720 Modeler - support tab key to navigate between fields and rows in the attribute table

intermediate patch by Ilya...
aadamchik: converted line delimiters to UNIX

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1455277 13f79535-47bb-0310-9956-ffa450edef68