[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/Services/LoggerService.cs

@@ -129,6 +129,11 @@ public partial class LoggerService : ILoggerService
 #endif
     }
 
+    public void LogResults(FluentResults.Result result)
+    {
+        throw new NotImplementedException();
+    }
+
     public void LogDebug(string message, Color? color = null)
     {
         throw new NotImplementedException();
@@ -145,5 +150,5 @@ public partial class LoggerService : ILoggerService
     }
 
     public void Dispose() { }
-    public void Reset() { }
+    public FluentResults.Result Reset() => FluentResults.Result.Ok();
 }