Fixed ISF bitmap source import

BS-665788433
Fixed crashes on accepting corrupted cartridges.

- BS-657158079: crash on loading cartridge with early EOF.
- BS-650638268: crash on loading cartridges with invalid declared media
positions; read-only stream seeking after EOF.
Fixed rare crash during thumbnail generation.

BS-666058114: targetHeight is invalid in SaveJpeg.
Minor SkyDrive changes

- Reenabled background DL
- Changed service name from SkyDrive to OneDrive.