Removed some manual management.

Apparently, the layout engine is written in something resembling
either Java or Google's G+.  It's "C++", but there's no exceptions,
manual memory management, etc.  But it's also attempting to recreate
a subset of the Java Collections framework in C++.  It's a common
pattern in both beginner and older C++.

I'll completely replace all of this with standard C++ library types.

dw/layout.hh

@@ -5,6 +5,10 @@
 #   error Do not include this file directly, use "core.hh" instead.
 #endif
 
+#include <memory>
+#include <string>
+#include <unordered_map>
+
 namespace dw {
 namespace core {
 
@@ -181,8 +185,9 @@ private:
    bool scrollIdleNotInterrupted;
 
    /* Anchors of the widget tree */
-   lout::container::typed::HashTable <lout::object::String, Anchor>
-                                     *anchorsTable;
+   //lout::container::typed::HashTable <lout::object::String, Anchor>
+                                     //*anchorsTable;
+   std::unordered_map< std::string, std::unique_ptr< Anchor > > anchorsTable;
 
    SelectionState selectionState;
    FindtextState findtextState;