HPCC-10103 Initial WsSQL check in
- Adds ws_sql esp service
- Optionally built based on us antlr3c flag
- Requires ANTLR jar file for generating lexer/parser c code
- Requires ANTLR3c lib to build generated lexer/parser c code
- libantlr3c is not distributed, must be built (buildANTLR3c.cmake)
- Moves some Ws_Workunits functions and a class to ws_workunitshelpers.hpp
  for easier use by outside projects

- feature access fully wssql specific, configmgr, and cleanup
Signed-off-by: Rodrigo Pastrana <Rodrigo.Pastrana@lexisnexis.com>