fix: Cleans up core code (#1187)

**Only one functional change**
* Fixes a bug in LogFactory where `Warning` is being logged as `Information`

Non-functional changes:
* Updates/Fixes copyright headers
* Removes namespace scopes for core files.

View with [whitespace off](https://github.com/modernuo/ModernUO/pull/1187/files?w=1).

Projects/Server/Targeting/TargetFlags.cs

@@ -1,12 +1,11 @@
 using System;
 
-namespace Server.Targeting
+namespace Server.Targeting;
+
+[Flags]
+public enum TargetFlags : byte
 {
-    [Flags]
-    public enum TargetFlags : byte
-    {
-        None = 0x00,
-        Harmful = 0x01,
-        Beneficial = 0x02
-    }
+    None = 0x00,
+    Harmful = 0x01,
+    Beneficial = 0x02
 }