migrate grammar to ANTLR 4
major parser update

 - migrate to ANTLR 4 (no more java in the grammar)
 - update matric in Delta for accurate new # of tables and attrs
 - update SqlItems state to int
 - Key is now PrimaryKey
column type is now case insensitive
hide exeptions when expanding inserted or deleted attributes
if a list is empty the current item of the other is marked correctly