Remove KeyVersionAttribute class

DEVSIX-5807

Author: Eugene Bochilo

itext/itext.kernel/Properties/AssemblyInfo.cs

@@ -1,7 +1,6 @@
 using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
-using Versions.Attributes;
 
 [assembly: AssemblyTitle("iText.Kernel")]
 [assembly: AssemblyDescription("")]
@@ -22,8 +21,6 @@
 
 [assembly: Guid("be4c62cc-6495-47e1-ab00-05b1bfe331f6")]
 
-[assembly: KeyVersion("3.1.5.0")]
-
 [assembly: AssemblyVersion("7.2.0.0")]
 [assembly: AssemblyFileVersion("7.2.0.0")]
 [assembly: AssemblyInformationalVersion("7.2.0-SNAPSHOT")]

itext/itext.kernel/Properties/KeyVersionAttribute.cs

@@ -106,7 +106,6 @@
   <ItemGroup>
     <Compile Include="itext\kernel\**\*.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
-    <Compile Include="Properties\KeyVersionAttribute.cs" />
     <Compile Include="KernelExtensions.cs" />
   </ItemGroup>
   <ItemGroup>

itext/itext.kernel/itext.kernel.csproj

@@ -45,7 +45,6 @@ source product.
 using System.IO;
 using System.Reflection;
 using Microsoft.Extensions.Logging;
-using Versions.Attributes;
 using iText.Commons;
 using iText.Kernel.Actions.Data;
 
@@ -313,12 +312,9 @@ private static Type GetClassFromLicenseKey(String classPartialName) {
             String classFullName = null;
 
             Assembly kernelAssembly = typeof(Version).GetAssembly();
-            Attribute keyVersionAttr = kernelAssembly.GetCustomAttribute(typeof(KeyVersionAttribute));
-            if (keyVersionAttr is KeyVersionAttribute) {
-                String keyVersion = ((KeyVersionAttribute)keyVersionAttr).KeyVersion;
-                String format = "{0}, Version={1}, Culture=neutral, PublicKeyToken=8354ae6d2174ddca";
-                classFullName = String.Format(format, classPartialName, keyVersion);
-            }
+            String keyVersion = "3.1.5.0";
+            String format = "{0}, Version={1}, Culture=neutral, PublicKeyToken=8354ae6d2174ddca";
+            classFullName = String.Format(format, classPartialName, keyVersion);
 
             Type type = null;
             if (classFullName != null) {