[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/_Interfaces/IPackageService.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Diagnostics.CodeAnalysis;
+using Barotrauma.LuaCs.Data;
+using FluentResults;
+
+namespace Barotrauma.LuaCs.Services;
+
+public interface IPackageService : IReusableService, 
+    // These allow us the pass the IContentPackageService to anything that needs the data without having to directly reference the member
+    IResourceCultureInfo, IAssembliesResourcesInfo, ILocalizationsResourcesInfo, ILuaScriptsResourcesInfo
+{
+    ContentPackage Package { get; }
+    IModConfigInfo ModConfigInfo { get; }
+    bool IsEnabledInModList { get; }
+    /// <summary>
+    /// Try to load the XML config and resources information from the given package.
+    /// </summary>
+    /// <param name="package"></param>
+    /// <returns>Whether the package was parsed without errors.</returns>
+    FluentResults.Result LoadResourcesInfo([NotNull]LoadablePackage package);
+    /// <summary>
+    /// Tries to load all assemblies and instance plugins for the given resources list, regardless whether they're marked as optional and/or lazy load.
+    /// Will sort by load priority unless overriden/bypassed.
+    /// </summary>
+    /// <param name="assembliesInfo"></param>
+    /// <param name="ignoreDependencySorting"></param>
+    /// <returns>Whether loading is successful. Returns true on an empty list.</returns>
+    FluentResults.Result LoadPlugins([NotNull]IAssembliesResourcesInfo assembliesInfo, bool ignoreDependencySorting = false);
+    FluentResults.Result LoadLocalizations([NotNull]ILocalizationsResourcesInfo localizationsInfo);
+    FluentResults.Result AddLuaScripts([NotNull]ILuaScriptsResourcesInfo luaScriptsInfo);
+#if CLIENT
+    FluentResults.Result LoadStyles([NotNull]IStylesResourcesInfo stylesInfo);
+#endif
+    FluentResults.Result LoadConfig([NotNull]IConfigsResourcesInfo configsResourcesInfo, [NotNull]IConfigProfilesResourcesInfo configProfilesResourcesInfo);
+}
+