Add rpgle-repl to Notebook

[tom-writes-code]

Expose rpgle-repl to Notebooks.

DB2 i notebooks already allow inline SQL code snippets to be executed on the fly.

This functionality allows for small RPG examples to be included too, which could be used to confirm behaviour of %BiFs, or for simple training examples.

RPGLE-REPL was changed to allow code to be passed in to an SQL function, which then runs the REPL process, and returns a data set which can be parsed back to the user.

Setting for where RPGLEREPL lives (blank by default)

Option to change language mode

No connection, same as SQL

Configuration not installed

Compilation failure

Successful run

[tom-writes-code]

The thing I'd love to change but can't work out where it comes from is the syntax highlighting - I'd love it to treat column 1 as the start of the line, rather than column 7 or 8.