Use a different approach to prevent ForceClose after the application has been put...

Use a different approach to prevent ForceClose after the application has been put to sleep for a long period of time.  Each of the fragments in the Viewer will do their setup in onResume instead of in onCreateView.  Further, the ProgressDialogFragment used in the OpenRocketLoaderFragment now exposes a dismissAllowStateLoss method so the dialog can be dismissed if the application is put in the background while loading.

git-svn-id: https://openrocket.svn.sourceforge.net/svnroot/openrocket/trunk@797 180e2498-e6e9-4542-8430-84ac67f01cd8