Bnf updates (#103)

* Re-generated code from existing BNF file. No changes applied.

* Added tokens DO, FOR, REQUIRE, MANDATORY, SCALAR, OF, ADD.
Simplified regexps.

* Minor BNF simplification.

* Tokens added to reserved keywords list.
Sorted in descending order so that greedy parser would not pick any wrong token.

* Fix for: CALL apoc.schema.assert({}, {}); gets reformatted to ASSERT #92

* Clauses divided to read and update categories, improving parsing quality.
Foreach is now accepting only valid inner clauses.

* Fix for: Add support in parser for YIELD ... WHERE #89
Standalone call definition added.
Added test queries from Cypher Query Language Reference Version 9.

* Fix for: Reformat uglifies query and incorrectly interprets it. #72

Author: GreYko