Mac file dialog plug-in: Don't try to use 'gcc-4.0'

There is no longer any gcc-4.0.
Mac: Force 32-bit build

The latest version of Xcode defaults to a 64 bit build.
Update Wings3d.xodeproj for Xcode 4.5.2
MyController.m: Eliminate warnings

The first argument for NSLog() should be a format string, not an
arbitrary string.

The Gestalt() function is deprecated starting in OS X 10.8.
Since the only purpose of the call was to avoid running on too old
versions of OS X, we can simply remove the call since the deployment
version set in the binary will server the same purpose.
mac_wings_image_drv.m: Fix use of deprecated function
wp8_mac_file: Use the new Mac file dialog in esdl
Mac: Add support for code signing