Optimized Layer0Utils.getPossibleDefaultBinding

Removed badly named datatype_binging public static field from
Layer0Utils in favor of Bindings.DATATYPE. If you were using the
previous Layer0Utils constant in some place, just replace it.

The problem in the optimized code was that it was constantly converting
SCL types like "Double", "Boolean" etc. to databoard datatypes using the
databoard type parser even though those basic primitive types should
have been already premapped somewhere to prevent the need for any kind
of parsing.

gitlab #242

Change-Id: I336d5ebb6b5dbe080372d5b7304d5608f0472297