[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/LuaCs/LuaCsUtility.cs

@@ -11,6 +11,7 @@ using System.Linq;
 using System.Net;
 using System.Reflection;
 using System.Xml.Linq;
+using Barotrauma.LuaCs;
 
 namespace Barotrauma
 {
@@ -262,7 +263,8 @@ namespace Barotrauma
 
         private static Type[] LoadDocTypes(XElement typesElem)
         {
-            var result = new List<Type>();
+            throw new NotImplementedException();
+            /*var result = new List<Type>();
             var loadedTypes = LuaCsSetup.AssemblyManager
                 .GetAllTypesInLoadedAssemblies()
                 .ToImmutableHashSet();
@@ -279,7 +281,7 @@ namespace Barotrauma
                 result.AddRange(typesFound);
             }
 
-            return result.ToArray();
+            return result.ToArray();*/
         }
 
         private static IEnumerable<XElement> SaveDocTypes(IEnumerable<Type> types)