Max's "custom attribute" are not exported correctly as awd's extra data

[rdoi]

There is something wrong with the Max object "custom attribute" parsing to Away's ObjectContainer3D.extra data:

• The attribute name comes with the last character cropped (length -1):
  I.e: "parameteR" -> "paramete"
• The attribute value comes with only the first character.
  I.e: "My Long Value" -> "M"

Tested with plugin v0.9.89 / 3DS Max 2014.