Improve inheritance support in the CEF API (issue #1623).

- Support single parent inheritance in CEF API classes.
- Support non-virtual inheritance in CEF API classes.
- Support translation of CEF API sub-directories.
- Add test sub-directories for testing-only functionality that will be
  available to unit tests but not exposed via the binary distribution.
- Add unit tests for the translator tool.
- Fix parsing of template parameter types that include commas.

libcef_dll/ctocpp/string_visitor_ctocpp.h

@@ -28,14 +28,11 @@ class CefStringVisitorCToCpp
     : public CefCToCpp<CefStringVisitorCToCpp, CefStringVisitor,
         cef_string_visitor_t> {
  public:
-  explicit CefStringVisitorCToCpp(cef_string_visitor_t* str)
-      : CefCToCpp<CefStringVisitorCToCpp, CefStringVisitor,
-          cef_string_visitor_t>(str) {}
+  CefStringVisitorCToCpp();
 
-  // CefStringVisitor methods
+  // CefStringVisitor methods.
   void Visit(const CefString& string) override;
 };
 
 #endif  // BUILDING_CEF_SHARED
 #endif  // CEF_LIBCEF_DLL_CTOCPP_STRING_VISITOR_CTOCPP_H_
-