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: I6ab463996dda47554839f482da47f561f76663a7
Reviewed-by: Erik Verbruggen <erik.verbruggen@nokia.com>

src/plugins/texteditor/texteditorsettings.cpp

@@ -145,6 +145,7 @@ TextEditorSettings::TextEditorSettings(QObject *parent)
     formatDescriptions.append(FormatDescription(QLatin1String(C_FIELD), tr("Field"), Qt::darkRed));
     formatDescriptions.append(FormatDescription(QLatin1String(C_STATIC), tr("Static"), Qt::darkMagenta));
 
+    formatDescriptions.append(FormatDescription(QLatin1String(C_FUNCTION), tr("Function")));
     FormatDescription virtualMethodFormatDescriptor(QLatin1String(C_VIRTUAL_METHOD), tr("Virtual Method"));
     virtualMethodFormatDescriptor.format().setItalic(true);
     formatDescriptions.append(virtualMethodFormatDescriptor);