fix(core): Removes some uses of Linq (#421)

- [X] Removes some uses of linq
- [X] Creates struct based enumerator for Skills
- [X] Creates a struct based enumerator for TypeCache
- [X] Changes HarvestDefinition to an init array instead of List
- [X] Changes HeritageTokenGump Response from List to Array

Projects/UOContent/Targets/BladedItemTarget.cs

@@ -72,7 +72,7 @@ namespace Server.Targets
                 }
 
                 HarvestSystem system = Lumberjacking.System;
-                var def = Lumberjacking.System.GetDefinition();
+                var def = system.GetDefinition();
 
                 if (!system.GetHarvestDetails(from, m_Item, targeted, out var tileID, out var map, out var loc))
                 {