mime_db Add additional disk image types

* Two disk image types added to the mime_db with sniffer rules

1 x-intel-image as a generic type for images using an intel
partition style boot sector

mime_db Add additional disk image types

* Two disk image types added to the mime_db with sniffer rules

1 x-intel-image as a generic type for images using an intel
partition style boot sector
2 x-ntfs-image a specific type for ntfs format image files

Default handler for these types is set to mountvolume, which
handles ntfs and fat images detected by these sniffers,
in the same manner as bfs images detected by x-bfs-image.

Change-Id: I994fa23bcc988c40a098aa106587e75d9e1f9b4b
Reviewed-on: https://review.haiku-os.org/c/964
Reviewed-by: Stephan Aßmus <superstippi@gmx.de>

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