Introduced a very simple "singleton" service-locator, which allowed for a removal of specific implementations which were very limited. With this it's easier to access dependencies.

GreenshotPlugin/Core/SimpleServiceProvider.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using GreenshotPlugin.Interfaces;
+
+namespace GreenshotPlugin.Core
+{
+    /// <summary>
+    /// A really cheap and simple DI system
+    /// </summary>
+    public class SimpleServiceProvider : IServiceLocator
+    {
+        private readonly Dictionary<Type, List<object>> _services = new Dictionary<Type, List<object>>();
+
+        public static IServiceLocator Current { get; } = new SimpleServiceProvider();
+
+        public IEnumerable<TService> GetAllInstances<TService>()
+        {
+            var typeOfService = typeof(TService);
+            if (!_services.TryGetValue(typeOfService, out var results))
+            {
+                yield break;
+            }
+            foreach (TService result in results)
+            {
+                yield return result;
+            }
+        }
+
+        public TService GetInstance<TService>()
+        {
+            return GetAllInstances<TService>().SingleOrDefault();
+        }
+
+        public void AddService<TService>(IEnumerable<TService> services)
+        {
+            var serviceType = typeof(TService);
+            if (!_services.TryGetValue(serviceType, out var currentServices))
+            {
+                currentServices = new List<object>();
+                _services.Add(serviceType, currentServices);
+            }
+
+            foreach (var service in services)
+            {
+                currentServices.Add(service);
+            }
+        }
+
+        public void AddService<TService>(params TService[] services)
+        {
+            AddService(services.AsEnumerable());
+        }
+    }
+}