Migration to a ServiceWorker for most tasks.

Implementation of basic PatchComplianceTask. First real iteration, basic/raw asf.

LD-SysInfo/Services/ScheduledTask.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Threading.Tasks;
+
+namespace LD_SysInfo.Services
+{
+    /// <summary>
+    /// Base interface for scheduled tasks
+    /// </summary>
+    public interface IScheduledTask
+    {
+        string TaskName { get; }
+        TimeSpan Interval { get; }
+        DateTime? LastRun { get; set; }
+        Task ExecuteAsync();
+        bool ShouldRun();
+    }
+
+    /// <summary>
+    /// Base class for scheduled tasks with common logic
+    /// </summary>
+    public abstract class ScheduledTask : IScheduledTask
+    {
+        public abstract string TaskName { get; }
+        public abstract TimeSpan Interval { get; }
+        public DateTime? LastRun { get; set; }
+
+        public abstract Task ExecuteAsync();
+
+        public virtual bool ShouldRun()
+        {
+            if (LastRun == null) return true;
+            return DateTime.Now - LastRun >= Interval;
+        }
+    }
+}