VELOCITY-674 remove unused imports, add serialVersionUIDs and other things Eclipse complains about (thanks to Jarkko Viinamaki who really needs to finish getting his commit perms)

git-svn-id: https://svn.apache.org/repos/asf/velocity/engine/trunk@898032 13f79535-47bb-0310-9956-ffa450edef68
51 files changed