Fixed EffectParameter memory leak.

src/Library/EffectParameter.hpp

@@ -23,6 +23,12 @@ namespace CreatureLib::Library {
         EffectParameter(const EffectParameter& other) = delete;
         EffectParameter& operator=(const EffectParameter& other) = delete;
 
+        ~EffectParameter() {
+            if (_type == EffectParameterType::String) {
+                delete[](char*) _val;
+            }
+        }
+
         EffectParameterType GetType() const noexcept { return _type; }
         bool AsBool() const {
             if (_type != EffectParameterType::Bool) {