New: Integration of capp_lint in xCodeCapp

Now capp_lint is fully integrated in xCodeCapp.
You can check the entire project with the menuitem of the app.
There is an option in the preference to make a capp_lint (on the file who was just processed) each time a file is processed by xCodeCapp.
Error of capp_lint are reported in the error tableView. The messages displayed the following informations : path of the file, line and error.

Tools/XcodeCapp/XcodeCapp/UserDefaults.m

@@ -25,3 +25,4 @@ NSString * const kDefaultLogLevel = @"logLevel";
 NSString * const kDefaultAutoOpenXcodeProject = @"autoOpenXcodeProject";
 NSString * const kDefaultShowProcessingNotices = @"showProcessingNotices";
 NSString * const kDefaultUseSymlinkWhenCreatingProject = @"useSymlinkWhenCreatingProject";
+NSString * const KDefaultUsesCappLintForEveryNotifications = @"usesCappLintForEveryNotifications";