New hpcc 10103 ws sql

Adds ws_sql ESP service.
Provides SQL interface into HPCC.
Translates SQL queries and generates ECL code.
Utilizes WS_workunit features to compile, and execute generated ECL code.

Adds ANTLR and ANTLR3c dependancies.
ANTLR (used to generate lexer/parser C code) is expected to be present in build machine. 
Jenkins build machines currently contain this dep here: /usr/local/ANTLR/3.4/
Distribution download is here: http://www.antlr3.org/download/antlr-3.4-complete.jar

ANTLR3c is automatically downloaded, extracted, configured and built (see cmake_modules/buildAntlr3c.cmake)
libAntlr3c is required for C targeted lexer/parser code.