Keep generated class files for debugging purposes
Set "grails.mime.use.accept.header = true" by default in ControllerUnitTestMixin
Revert "Make Controller & Domain class calls direct in ResourceTransform"

This reverts commit a6ca1c5788e1b34df929159606a14894f84681ef.
Fix EntityASTTransformation error handling in builds outside of Grails
don't reuse a 'this' VariableExpression, build a new instance for each usage
Use VariableScopeVisitor for handling VariableScope in ResourceTransform methods
Fix NPE in calling Math.max