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.
Fixed: capp_lint on the entire project doesn't remove the content of the error tableview
Fixed: capp_lint for the entire project is not launch from a thread
Fixed: capp_lint doesn't handle protocol

Previously capp_lint didn't handle protocol. Now it does

Fixed #2060
Fixed: xib of xCodeCapp is in format 5.1
Merge pull request #2106 from Dogild/CappLintxCode

New: Integration of capp_lint in xCodeCapp