HPCC-11381 - add a sort/sortReverse methods to StringArray

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
HPCC-11256 - Introduce new SDS node subscription mechanism

Allows clients to subscribe to existing SDS nodes, rather than
a dynamically matching xpath.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>