MBS Filemaker Plugin, version 2.4pr7

New in this prerelease of the 2.4 plugins:

Added DragDrop.SetImage function.
Added ProgressDialog.ClearImage function.
Now includes Intel only version of plugin. You need that for a Runtime in the Apple Mac App Store.
Added USB functions to find and list connected USB devices.
DropArea now positioned correctly if used with a control.
Graphicsmagick image references are now validated before being used. This avoids some trouble.
Graphicsmagick functions WriteTo*Container now check if compression works.