feat: add new indicators (Decay, Edecay, MinusDi, MinusDm, PlusDi, PlusDm, Maxindex, Minindex, Sarext) and update pine scripts, core libs, validation tests, and python bindings

lib/errors/mdape/Mdape.cs

@@ -58,7 +58,7 @@ public sealed class Mdape : AbstractBase
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public TValue Update(double actual, double predicted, bool isNew = true)
     {
-        return UpdateCore(DateTime.UtcNow, actual, predicted, isNew);
+        return UpdateCore(DateTime.MinValue, actual, predicted, isNew);
     }
 
     public override TValue Update(TValue input, bool isNew = true)

lib/errors/mdape/mdape.pine

@@ -1,4 +1,4 @@
-// The MIT License (MIT)
+// Licensed under the Apache License, Version 2.0
 // © mihakralj
 //@version=6
 indicator("Median Absolute Percentage Error", "MdAPE", overlay=false, format=format.percent)