Add option to choose what to do about keywords case

[turbofart]

Is your feature request related to a problem? Please describe

Sometimes, I don't want to have keywords uppercased.

Describe the solution you'd like

I would like to be able to have as input argument a way to say if I want the SQL keywords to be UPPER-cased, lower-cased, or not touched, in case somebody decides to start the keywords with a big letter. But the most important is to be able to have lower-cased keywords. Nowadays, with syntax highlighting, it is not necessary to write keywords in UPPER, let's that be indicated by different color in the IDE.