ETCH-261 Splitting up large initParams function in CPP code generator

Change-Id: Ie3b291fc3e0a4817f4a9628a79629ab7e6debd70

git-svn-id: https://svn.apache.org/repos/asf/etch/trunk@1460560 13f79535-47bb-0310-9956-ffa450edef68