FBX IO has been converting the Camera `FocusDistance` property from
millimeters on import and to millimeters on export, however, this
appears to have been incorrect because `FocusDistance` appears to be
in meters instead.
The FBX SDK used to have deprecated `SetSpecificDistance()` and
`GetSpecificDistance()` functions that were documented as accessing
Camera Focus Distance in millimeters.
The documentation of these functions appears to have been incorrectly
attributed to the Camera Focus Distance property itself, which could be
accessed directly without the deprecated functions, and appears to be
stored in meters.
