[Guided Decision Table] Remove support for in-pattern eval

See https://issues.jboss.org/browse/GUVNOR-3432?focusedCommentId=13474867&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13474867

Also, please note that eval() inside patterns should not be used. The parser actually strips out all the eval()s inside patterns that it finds. Only top level evals are still useful.

Support for "predicate" columns in the Guided Decision Table Editor need to be removed. Support in the UI and model-DRL conversion can be removed. We would also need to write a conversion routine converting predicates to BRL Condition Column RuleModel expressions. There may be a limitation to what the Expression Editor can support; so we'd need to fall back to Free From Lines.