Add option to exclude "reasoning" tokens from Max Output for thinking models

[VL4DST3R]

The thinking process in DeepSeek-derived models can often be longer than the final result, but the user has no way to anticipate this, which often leads to just an incomplete thinking process with no final answer.

It would be very nice to include an option where the model can "think" as much as needed (or within a separately defined limit) without counting those tokens toward the final Max Output. This would allow the reasoning phase to function more independently since it’s not necessarily intended for the user to see or directly use it.

From my attempt to somewhat circumvent this I would also like to know: is there currently a way to define (via arguments) the initial Max Output size? Or the effective range available in the ui slider? I know you can manually type values above 512, but a way to set it like you can --contextsize would be welcomed as well.