Added a layer of abstraction between RGB.NET and Artemis

This means Artemis can add extra functionality
It also avoid having to reference RGB.NET for basic rendering
Implemented rendering scaling

src/Artemis.Core/Services/SettingsService.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Artemis.Core.Plugins.Models;
+using Artemis.Core.Services.Interfaces;
+using Artemis.Storage.Entities;
+using Artemis.Storage.Repositories.Interfaces;
+using Newtonsoft.Json;
+
+namespace Artemis.Core.Services
+{
+    /// <inheritdoc />
+    public class SettingsService : ISettingsService
+    {
+        private readonly PluginInfo _buildInPluginInfo;
+        private readonly IPluginSettingRepository _pluginSettingRepository;
+        private readonly Dictionary<string, PluginSettingEntity> _settingEntities;
+
+        internal SettingsService(IPluginSettingRepository pluginSettingRepository)
+        {
+            _pluginSettingRepository = pluginSettingRepository;
+            _buildInPluginInfo = new PluginInfo {Guid = Guid.Parse("ffffffff-ffff-ffff-ffff-ffffffffffff"), Name = "Artemis Core"};
+
+            _settingEntities = pluginSettingRepository.GetByPluginGuid(_buildInPluginInfo.Guid).ToDictionary(se => se.Name);
+        }
+
+        public PluginSetting<T> GetSetting<T>(string name, T defaultValue = default(T))
+        {
+            lock (_settingEntities)
+            {
+                if (_settingEntities.ContainsKey(name))
+                    return new PluginSetting<T>(_buildInPluginInfo, _pluginSettingRepository, _settingEntities[name]);
+
+                var settingEntity = new PluginSettingEntity {Name = name, PluginGuid = _buildInPluginInfo.Guid, Value = JsonConvert.SerializeObject(defaultValue)};
+                _pluginSettingRepository.Add(settingEntity);
+                _pluginSettingRepository.Save();
+
+                _settingEntities.Add(name, settingEntity);
+                return new PluginSetting<T>(_buildInPluginInfo, _pluginSettingRepository, _settingEntities[name]);
+            }
+        }
+    }
+
+    /// <summary>
+    ///     <para>A wrapper around plugin settings for internal use.</para>
+    ///     <para>Do not inject into a plugin, for plugins inject <see cref="PluginSettings" /> instead.</para>
+    /// </summary>
+    public interface ISettingsService : IProtectedArtemisService
+    {
+        PluginSetting<T> GetSetting<T>(string name, T defaultValue = default(T));
+    }
+}