CppHighlighter: highlight all functions/methods.

- Highlight all function/methods (not just virtual methods).
- Highlight as a function even if number of arguments does not match. In
  that case, add a diagnostic message to indicate there are too many/too
  few arguments.
- Fix highlighting of parameters in function declarations.
  These used to be handled indiferently, and they could be mistaken for
  type or field references.
- Properly highlight template method calls.

Change-Id: I6e61c9ee47763db95c62314f9cc1c4d398df38b3
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>

src/plugins/texteditor/texteditorsettings.cpp

@@ -145,6 +145,7 @@ TextEditorSettings::TextEditorSettings(QObject *parent)
     formatDescriptions.append(FormatDescription(C_FIELD, tr("Field"), Qt::darkRed));
     formatDescriptions.append(FormatDescription(C_STATIC, tr("Static"), Qt::darkMagenta));
 
+    formatDescriptions.append(FormatDescription(C_FUNCTION, tr("Function")));
     FormatDescription virtualMethodFormatDescriptor(C_VIRTUAL_METHOD, tr("Virtual Method"));
     virtualMethodFormatDescriptor.format().setItalic(true);
     formatDescriptions.append(virtualMethodFormatDescriptor);