Slider control now uses Accent Color

ComboBox enter key now uses Accent Color
Some code cleanup
Updated release notes

ModernKeePass/Services/SingletonServiceBase.cs

@@ -4,8 +4,6 @@ namespace ModernKeePass.Services
 {
     public abstract class SingletonServiceBase<T> where T : new()
     {
-        protected SingletonServiceBase() { }
-
         private static readonly Lazy<T> LazyInstance =
             new Lazy<T>(() => new T());