ON Statement issues

[eglekaz]

1. Keyword NEW is parsed as NE and W.
2. Keyword OLD is causing an error.

Example:

ON WRITE OF Customer NEW new-cust OLD old-cust DO:
     a += 3.
END.

Reference:
https://documentation.progress.com/output/ua/OpenEdge_latest/pdsoe/PLUGINS_ROOT/com.openedge.pdt.langref.help/rfi1424920563735.html

[jkbz64]

3397350 fixed only issue .2, first one is a duplicate of #53

[jkbz64]

note that on_statement is still not fully implemented, would need more examples of complicated ones, OR's and revert blocks...