kobold integration of min_p sampler (+1 squashed commits)

Squashed commits:

[8ad2e349] kobold integration for min_p sampler

common/common.h

@@ -58,6 +58,7 @@ struct gpt_params {
     // sampling parameters
     int32_t top_k             = 40;    // <= 0 to use vocab size
     float   top_p             = 0.95f; // 1.0 = disabled
+    float   min_p             = 0.0f; // 0.0 = disabled
     float   tfs_z             = 1.00f; // 1.0 = disabled
     float   typical_p         = 1.00f; // 1.0 = disabled
     float   temp              = 0.80f; // 1.0 = disabled