update many projects to .NET Standard 2.0

Pilz.Cryptography/Pilz.Cryptography.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net48</TargetFramework>
+    <TargetFramework>netstandard2.0</TargetFramework>
     <AssemblyTitle>Pilz.Cryptography</AssemblyTitle>
     <Product>Pilz.Cryptography</Product>
     <Copyright>Copyright ©  2020</Copyright>
@@ -14,7 +14,4 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
   </ItemGroup>
-  <ItemGroup>
-    <Reference Include="Microsoft.VisualBasic" />
-  </ItemGroup>
 </Project>

Pilz.Cryptography/SimpleStringCrypter.cs

@@ -5,7 +5,6 @@ using System.Text;
 using System.Threading.Tasks;
 using System.Security.Cryptography;
 using System.IO;
-using Microsoft.VisualBasic.CompilerServices;
 
 namespace Pilz.Cryptography
 {
@@ -35,7 +34,11 @@ namespace Pilz.Cryptography
             SHA1CryptoServiceProvider sha1CryptoServiceProvider = new SHA1CryptoServiceProvider();
             byte[] bytes = TextEncoding.GetBytes(key);
             byte[] array = sha1CryptoServiceProvider.ComputeHash(bytes);
-            return (byte[])Utils.CopyArray(array, new byte[checked(length - 1 + 1)]);
+
+            var output = new byte[checked(length - 1 + 1)];
+            array.CopyTo(output, 0);
+
+            return array;
         }
 
         private string EncryptData(string plaintext)