Feature : Hope to add Set/Update System Role‘s content & Option params

[armstrong1972]

Hope to add a new setup page , we can set or update follow items :

1. System Role‘s content
2. Commonly used Option params
   - temperature = 0.9
   - top_p = 0.95
   - top_k = 40
   - repeat_penalty =1.2
   - min_p = 0.05
   - num_ctx = 4096