Cleanup & Fixes for .NET 5 (#309)

- [X] Fixes several bugs
- [X] Updates more ordinal issues
- [X] Cleans up the code a bit
- [X] Turns classes static that should have been
- [X] Changes TcpServer.Instances to a HashSet

Bumps release version

Projects/Server.Tests/Tests/Network/Packets/Outgoing/EffectPacketTests.cs

@@ -6,8 +6,7 @@ namespace Server.Tests.Network
 {
     public class EffectPackets
     {
-        [Theory]
-        [InlineData(10, 1000, 10, 5)]
+        [Theory, InlineData(10, 1000, 10, 5)]
         public void TestSoundEffect(ushort soundID, int x, int y, int z)
         {
             var p = new Point3D(x, y, z);
@@ -91,9 +90,7 @@ namespace Server.Tests.Network
             AssertThat.Equal(actual, expected);
         }
 
-        [Theory]
-        [InlineData(ScreenEffectType.DarkFlash)]
-        [InlineData(ScreenEffectType.FadeInOut)]
+        [Theory, InlineData(ScreenEffectType.DarkFlash), InlineData(ScreenEffectType.FadeInOut)]
         public void TestScreenEffect(ScreenEffectType screenType)
         {
             var expected = new ScreenEffect(screenType).Compile();