HPCC-12469 Implement import ^ as ... to access root scope

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-2566 Allow attribute values to be specified on the command line

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-2566 Add -D support to ecl run/deploy etc.

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #6567 from ghalliday/issue2566

HPCC-2566 Allow attribute values to be specified on the command line

Reviewed-By: Jamie Noss <james.noss@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>