New: xCodeCapp 3.2, command objj on each processing files or on the entire project

This pull requests adds a nice feature to xCodeCapp, now each time a fill is processing, xCodeCapp will launch the command objj to check the compilation issues. If it finds something, it will show them up on the classic error panel. This basically show import warnings, warnings you don't catch with your browser but only during the build of the application.
Objj is only launched if no errors was found after the first parsing (the parser which translate a file to objective-c).

This feature can be disabled on the preferences panel.

The menu has a new menu item "Check Compilation Issues". This action will launch objj on each files of the project and shows warnings and errors found.

The command objj will take automatically the OBJJ_INCLUDE_PATH in the index.html or index-debug.html. This options can be disabled in the preferences panel as well.

This PR only works with the PR #2248