[Milestone] AssemblyLoader completed.

Details:
- Assembly Mgmt Service for loading now a separate interface, not intended for normal use.
- Assembly Loader work; implemented custom dictionary key and table.
- Assembly loading work.
- EventService completed.
- Moved assembly extensions to ModUtils.cs
- Work to event service.
NetworkService work
- Added ImpromptuInterfaces package.
- Networking Service work to support NetVars
- Event Service
- Added assemblies references package for script compilation. Updated Roslyn version for compatibility.
- Package Loading work.
Swap Harmony to HarmonyX
- More refactor conversion to FluentResults.
- Updated StylesService to return Results.
- Refactor of PackageService partially complete.
- Made IService.Reset() required to return a Result.
- Moved plugin/assembly related code to their own folder (same namespace).
- Updated interfaces to reflect the use of Result<T>.
- Partial refactor, incomplete.
- Added 'FluentResults' so we can stop using cursed Exception-based flow control in loading code.
- Added 'OneOf' nuget package: https://github.com/mcintyre321/OneOf
for the implementation of the Optional<T> pattern and complex discrete return types instead of cursed enums (see current AssemblyManager.cs).
- Reapplied old branch changes.

Barotrauma/BarotraumaShared/SharedSource/Items/Item.cs

@@ -1411,7 +1411,7 @@ namespace Barotrauma
             if (Components.Any(ic => ic is Wire) && Components.All(ic => ic is Wire || ic is Holdable)) { isWire = true; }
             if (HasTag(Barotrauma.Tags.LogicItem)) { isLogic = true; }
 
-            GameMain.LuaCs.Hook.Call("item.created", this);
+            GameMain.LuaCs.Hook.Call<Item>("item.created", this);
 
             ApplyStatusEffects(ActionType.OnSpawn, 1.0f);
 
@@ -4622,7 +4622,7 @@ namespace Barotrauma
                 body = null;
             }
 
-            GameMain.LuaCs.Hook.Call("item.removed", this);
+            GameMain.LuaCs.Hook.Call<Item>("item.removed", this);
         }
 
         public override void Remove()
@@ -4708,7 +4708,7 @@ namespace Barotrauma
 
             RemoveProjSpecific();
 
-            GameMain.LuaCs.Hook.Call("item.removed", this);
+            GameMain.LuaCs.Hook.Call<Item>("item.removed", this);
         }
 
         private void RemoveFromLists()