Secure Messaging

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6.8 improvements:
- A back button to loading screens was added
- The delivery slip on large files can now be viewed correctly
- The preview button for un-previewable file types is now greyed out
- An issue where the keyboard was appearing after entering the wrong credentials has been fixed
- An issue with closing the "Login Required" popup has been fixed
- Enabling FYEO now enables Forward Freeze as well