HPCC-9401 Optimize query time WsEcl

The dependency on the xml schema from the query workunit to process
incoming queries greatly slows down WsECL.

Past optimizations have removed this dependency for some query paths,
but not others.  This removes the dependency for the rest of the query
paths.

Also add a toJSON function to jptree.

Also fix WsECL form, xsd, and other processing of child sets.

Also add a new type of REST input parameter.  Adding a $ to the end of
an input parameter will cause it to be treated as a \r\n delimited
input array (so that WsEcl no longer needs to use schema to process arrays on
input).  \r\n is used as a delimiter by HTML Forms.  Other delimiter support may
be added in the future.

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>