Git rid of recursive visitors to prevent SOEs

[BasLeijdekkers]

java.lang.StackOverflowError
at com.intellij.psi.impl.source.tree.CompositeElement.createPsiNoLock(CompositeElement.java:806)
at com.intellij.psi.impl.source.tree.CompositeElement.getPsi(CompositeElement.java:778)
at com.intellij.psi.impl.source.SourceTreeToPsiMap.treeElementToPsi(SourceTreeToPsiMap.java:30)
at com.intellij.psi.impl.source.tree.SharedImplUtil.getFirstChild(SharedImplUtil.java:52)
at com.intellij.extapi.psi.ASTDelegatePsiElement.getFirstChild(ASTDelegatePsiElement.java:101)
at com.intellij.psi.impl.PsiElementBase.acceptChildren(PsiElementBase.java:67)
at com.intellij.psi.PsiRecursiveElementVisitor.visitElement(PsiRecursiveElementVisitor.java:40)
at com.sixrr.stockmetrics.projectCalculators.SourceLinesOfCodeProjectCalculator$Visitor.visitElement(SourceLinesOfCodeProjectCalculator.java:42)