HPCC-12062 Add FromJSON function to ECL

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
HPCC-12062 Update based on review

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
HPCC-12029 - Optimize crc_file

Signed-off-by: Mark Kelly <mark.kelly@lexisnexis.com>
Win32 build break

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6355 from richardkchapman/build-break-win32

HPCC=9278 Fix Win32 build break

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>
Merge pull request #6336 from mckellyln/crc

HPCC-12029 - Optimize crc_file

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>
Merge pull request #6329 from afishbeck/fromJSON

HPCC-12062 Add FromJSON function to ECL

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>