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/focus_handler_ctocpp.h

@@ -28,11 +28,9 @@ class CefFocusHandlerCToCpp
     : public CefCToCpp<CefFocusHandlerCToCpp, CefFocusHandler,
         cef_focus_handler_t> {
  public:
-  explicit CefFocusHandlerCToCpp(cef_focus_handler_t* str)
-      : CefCToCpp<CefFocusHandlerCToCpp, CefFocusHandler, cef_focus_handler_t>(
-          str) {}
+  CefFocusHandlerCToCpp();
 
-  // CefFocusHandler methods
+  // CefFocusHandler methods.
   void OnTakeFocus(CefRefPtr<CefBrowser> browser, bool next) override;
   bool OnSetFocus(CefRefPtr<CefBrowser> browser, FocusSource source) override;
   void OnGotFocus(CefRefPtr<CefBrowser> browser) override;
@@ -40,4 +38,3 @@ class CefFocusHandlerCToCpp
 
 #endif  // BUILDING_CEF_SHARED
 #endif  // CEF_LIBCEF_DLL_CTOCPP_FOCUS_HANDLER_CTOCPP_H_
-