Bind an entity reference instead of an rvalue

Summary

Whenever a local-function is bound to an element, the element should be passed as an lvalue and not an rvalue. The bind(Element const&) function takes just a const& so we don't know what we get. This MR, fixes the binding in the intersections and stores the bound element in some local-functions instead of just creating a pointer to the argument.

dune/curvedgrid/gridfunctions/analyticdiscretefunction.hh

@@ -73,7 +73,7 @@ public:
   void bind (const LocalContext& localContext)
   {
     localContext_.emplace(localContext);
-    geometry_.emplace(localContext.geometry());
+    geometry_.emplace(localContext_->geometry());
 
     lfe_ = &cache_.get(localContext_->type());
     lfe_->localInterpolation().interpolate([&](const auto& local)