(proof-new) Update Theory interface for proof-new (#4648)

This includes 4 changes:

Theory constructor takes a ProofNodeManager,
Theory::explain returns a TrustNode (of kind PROP_EXP),
Theory::expandDefinitions returns a TrustNode (of kind REWRITE),
Theory::ppRewrite returns a TrustNode (of kind REWRITE).
These are all currently planned updates to the interface of Theory.
This PR also connects some of the existing proof rule checkers into the proof checker, if one is provided to the constructor. It updates TheoryEngine and other places to process TrustNode in trivial ways (converting them into Node). These calls will later be updated as needed for proof support.

This PR is also contingent on the performance tests for proof-new on SMT-LIB.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/theory/theory_engine.cpp b/src/theory/theory_engine.cpp
index 0b84893ae..851ae414e 100644
--- a/src/theory/theory_engine.cpp
+++ b/src/theory/theory_engine.cpp
@@ -1402,7 +1402,8 @@ Node TheoryEngine::getExplanationAndRecipe(TNode node, LemmaProofRecipe* proofRe
                              << " Responsible theory is: "
                              << theoryOf(atom)->getId() << std::endl;
 
-    Node explanation = theoryOf(atom)->explain(node);
+    TrustNode texplanation = theoryOf(atom)->explain(node);
+    Node explanation = texplanation.getNode();
     Debug("theory::explain") << "TheoryEngine::getExplanation(" << node << ") => " << explanation << endl;
     PROOF({
         if(proofRecipe) {
@@ -1877,7 +1878,8 @@ void TheoryEngine::getExplanation(std::vector<NodeTheoryPair>& explanationVector
     }
     else
     {
-      explanation = theoryOf(toExplain.d_theory)->explain(toExplain.d_node);
+      TrustNode texp = theoryOf(toExplain.d_theory)->explain(toExplain.d_node);
+      explanation = texp.getNode();
       Debug("theory::explain") << "\tTerm was propagated by owner theory: "
                                << theoryOf(toExplain.d_theory)->getId()
                                << ". Explanation: " << explanation << std::endl;