GeezerVison

This allows to temporarily change the statement separator with an inline comment and thus supports to execute statements that uses the semicolon within their expression, for example triggers or procedures with `BEGIN..END` blocks.

Example:

```sql
DROP PROCEDURE foobar;

--#SET TERMINATOR !
CREATE PROCEDURE foobar
BEGIN
    declare v char(10);
    select value into v from sometable;
    if v = 'test' then
        update sometable set value = '';
    end if;
END!

--#SET TERMINATOR ;
LABEL ON PROCEDURE foobar IS 'Example';
```

This commit fixes feature request 433 on sourceforge (https://sourceforge.net/p/squirrel-sql/feature-requests/433/).

It currently only supports the default QueryTokenizer. The statement separator is only changed for the current execution.

…with other length than 2

This makes this feature compatible to IBM CLP and Data Architect.
The documentation states:

> The statement must be uppercase and in a comment. There can be leading spaces before the --, but there cannot be spaces between -- and #SET TERMINATOR x

https://www.ibm.com/docs/en/ida/9.1.2?topic=terminators-changing-sql-statement-terminator