Initial refactor of rewrite rules, make theory_rewriterules empty theory.  Push kinds to quantifiers/kinds, rewrite rewrite rules in rewriter.
Fix rewrite rule attribute, refactor QCF, instantiation engine does not register rewrite rules, minor clean up.
QCF is now functional backend to rewrite rules. Support boolean variables in QCF.  Change check-model to ignore rewrite rules.  Incorporate some fixes from master.
Move rewrite of rewrite rules from rewriter to preprocessor, attribute becomes pattern.
Minor fixes to QCF/rewrite engine, removes RE on last call approach.  Add option for one inst per round in RE.