Implements accuracy/evasion

PkmnLib.Dynamic/Libraries/BattleStatCalculator.cs

@@ -27,4 +27,9 @@ public interface IBattleStatCalculator
     /// Calculate a single boosted stat of a Pokemon, including stat boosts.
     /// </summary>
     uint CalculateBoostedStat(IPokemon pokemon, Statistic stat);
+    
+    /// <summary>
+    /// Calculates the accuracy for a move, taking into account any accuracy modifiers.
+    /// </summary>
+    byte CalculateModifiedAccuracy(IExecutingMove executingMove, IPokemon target, byte hitIndex, byte moveAccuracy);
 }

PkmnLib.Dynamic/Models/BattleFlow/MoveTurnExecutor.cs

@@ -140,10 +140,10 @@ internal static class MoveTurnExecutor
             // modifying it.
             if (accuracy != 255)
             {
-                executingMove.RunScriptHook(x => x.ChangeAccuracy(executingMove, target, hitIndex, ref accuracy));
+                accuracy = battle.Library.StatCalculator.CalculateModifiedAccuracy(executingMove, target,
+                    hitIndex, accuracy);
             }
             
-            // TODO: Deal with accuracy/evasion stats.
             if (accuracy < 100 && battle.Random.GetInt(100) >= accuracy)
             {
                 executingMove.RunScriptHook(x => x.OnMoveMiss(executingMove, target));

PkmnLib.Dynamic/ScriptHandling/Registry/ScriptRegistry.cs

@@ -43,9 +43,10 @@ public class ScriptRegistry
         if (type == null)
             throw new ArgumentNullException(nameof(type));
 
-        var constructor = type.GetConstructor(Type.EmptyTypes);
+        var constructor = type.GetConstructor(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance,
+            null, Type.EmptyTypes, null);
         if (constructor == null)
-            throw new ArgumentException("The type must have a parameterless constructor.");
+            throw new ArgumentException($"Type {type} does not have a parameterless constructor.");
 
         // We create a lambda that creates a new instance of the script type.
         // This is more performant than using Activator.CreateInstance.

PkmnLib.Dynamic/ScriptHandling/Script.cs

@@ -207,7 +207,7 @@ public abstract class Script
     /// This function allows a script to modify the accuracy of a move used. This value represents
     /// the percentage accuracy, so anything above 100% will make it always hit.
     /// </summary>
-    public virtual void ChangeAccuracy(IExecutingMove move, IPokemon target, byte hit, ref byte accuracy)
+    public virtual void ChangeAccuracyModifier(IExecutingMove move, IPokemon target, byte hit, ref float modifier)
     {
     }