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/Text/StringHelpers.cs

@@ -169,6 +169,28 @@ namespace Server
             return str;
         }
 
+        public static string TrimMultiline(this string str, string lineSeparator = "\n")
+        {
+            var parts = str.Split(lineSeparator);
+            for (var i = 0; i < parts.Length; i++)
+            {
+                parts[i] = parts[i].Trim();
+            }
+
+            return string.Join(lineSeparator, parts);
+        }
+
+        public static string IndentMultiline(this string str, string indent = "\t", string lineSeparator = "\n")
+        {
+            var parts = str.Split(lineSeparator);
+            for (var i = 0; i < parts.Length; i++)
+            {
+                parts[i] = $"{indent}{parts[i]}";
+            }
+
+            return string.Join(lineSeparator, parts);
+        }
+
         public static List<string> Wrap(this string value, int perLine, int maxLines)
         {
             if ((value = value?.Trim() ?? "").Length <= 0)