[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/BarotraumaServer/ServerSource/GameMain.cs

@@ -368,7 +368,7 @@ namespace Barotrauma
                     performanceCounterTimer.Stop();
                     if (GameMain.LuaCs.PerformanceCounter.EnablePerformanceCounter)
                     {
-                        GameMain.LuaCs.PerformanceCounter.UpdateElapsedTime = (double)performanceCounterTimer.ElapsedTicks / Stopwatch.Frequency;
+                        GameMain.LuaCs.PerformanceCounter.AddElapsedTicks(new SimplePerformanceData("Update", performanceCounterTimer.ElapsedTicks));
                     }
                     performanceCounterTimer.Reset();
 
@@ -452,7 +452,7 @@ namespace Barotrauma
         public void Exit()
         {
             ShouldRun = false;
-            GameMain.LuaCs.Stop();
+            GameMain.LuaCs.Dispose();
         }
     }
 }