Bugfix: OracleTokenReader - optional parameter symbol and relational operators are correctly resolved

when there is no space between them and their operands
Improvement anf bugfix

Bugfix: OracleTokenReader - <> correctly resolved now
Added: OracleSqlParser - support for optional parameter clause, e. g.,
SELECT SQLPAD_FUNCTION(1, P2 => 2, P3 => 3) + 1,
SYS.STANDARD.ROUND(2.123456, RIGHT => 2) FROM DUAL