Added IPNDM and IPNDM_V sampler; added GITS and exponential schedule

StableDiffusion.NET/Enums/Sampler.cs

@@ -9,6 +9,7 @@ public enum Sampler
     DPMPP2SA,
     DPMPP2M,
     DPMPP2Mv2,
-    LCM,
-    N_Sample_Methods
+    IPNDM,
+    IPNDM_V,
+    LCM
 }

StableDiffusion.NET/Enums/Schedule.cs

@@ -5,6 +5,7 @@ public enum Schedule
     Default,
     Discrete,
     Karras,
+    Exponential,
     AYS,
-    N_Schedules
+    GITS
 }