Enable usage of Min_P Sampler, modify other sampler settings (#155)

This commit enables the use of min_p sampler, as well as giving the gradio app sliders to configure  top_p, min_p and repetition_penalty

Changed the defaults to min_p=0.05, rep_pen=1.2, top_p=1.0

min_p=0.00 - disables
top_p=1.00 - disables