fix: Cleans up file system paths and archiving (#815)

* Makes EnsureDirectory properly work for relative and absolute paths
* Adds a `PathUtility.GetFullPath` which returns full paths for relative paths to `Core.BaseDirectory`. If the path is absolute, it will return as-is.
* Moves EnsureDirectory to `PathUtility`. So `ScriptsHandler.EnsureDirectory` and `AssemblyHandler.EnsureDirectory` are now `PathUtility.EnsureDirectory`
* Fixes crash guard so that it copies accounts properly.
* Changes world save and auto archive to use a random folder name inside of the temp folder.

Projects/Server/Timer/Timer.TimerWheel.cs

@@ -242,7 +242,7 @@ namespace Server
             }
 
 #if DEBUG_TIMERS
-            tw.WriteLine("\nStack Traces:");
+            tw.WriteLine($"{Environment.NewLine}Stack Traces:");
             foreach (var kvp in DelayCallTimer._stackTraces)
             {
                 tw.WriteLine(kvp.Value);