HPCC-10247 This should convert field names from the source unicode encoding
(e.g., could be utf16)

Add conversion for fieldnames defined in the first row.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
HPCC-10247 This should convert field names from the source unicode encoding
(e.g., could be utf16)

Update after review.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge pull request #5044 from AttilaVamos/HPCC-10247-improvement

HPCC-10247 This should convert field names from the source unicode encoding  (e.g., could be utf16)

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>