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/v8handler_ctocpp.h

@@ -27,10 +27,9 @@
 class CefV8HandlerCToCpp
     : public CefCToCpp<CefV8HandlerCToCpp, CefV8Handler, cef_v8handler_t> {
  public:
-  explicit CefV8HandlerCToCpp(cef_v8handler_t* str)
-      : CefCToCpp<CefV8HandlerCToCpp, CefV8Handler, cef_v8handler_t>(str) {}
+  CefV8HandlerCToCpp();
 
-  // CefV8Handler methods
+  // CefV8Handler methods.
   bool Execute(const CefString& name, CefRefPtr<CefV8Value> object,
       const CefV8ValueList& arguments, CefRefPtr<CefV8Value>& retval,
       CefString& exception) override;
@@ -38,4 +37,3 @@ class CefV8HandlerCToCpp
 
 #endif  // BUILDING_CEF_SHARED
 #endif  // CEF_LIBCEF_DLL_CTOCPP_V8HANDLER_CTOCPP_H_
-