Fixes: Set icons for .hpp and .c files

Details:
Added one new purple icon for .c files and registered
the same icon for .hpp extensions.

src/plugins/cppeditor/cppeditor.qrc

@@ -4,5 +4,6 @@
         <file>images/qt_cpp.png</file>
         <file>images/qt_h.png</file>
         <file>CppEditor.mimetypes.xml</file>
+        <file>images/qt_c.png</file>
     </qresource>
 </RCC>

src/plugins/cppeditor/cppplugin.cpp

@@ -71,8 +71,12 @@ CppEditorFactory::CppEditorFactory(CppPlugin *owner) :
     Core::FileIconProvider *iconProvider = Core::FileIconProvider::instance();
     iconProvider->registerIconOverlayForSuffix(QIcon(":/cppeditor/images/qt_cpp.png"),
                                         QLatin1String("cpp"));
+    iconProvider->registerIconOverlayForSuffix(QIcon(":/cppeditor/images/qt_cpp.png"),
+                                        QLatin1String("hpp"));
     iconProvider->registerIconOverlayForSuffix(QIcon(":/cppeditor/images/qt_h.png"),
                                         QLatin1String("h"));
+    iconProvider->registerIconOverlayForSuffix(QIcon(":/cppeditor/images/qt_c.png"),
+                                        QLatin1String("c"));
 }
 
 QString CppEditorFactory::kind() const