Code cleanup. Implemented ability to schedule Library Backups.

API/Interfaces/Services/IScannerService.cs

@@ -0,0 +1,15 @@
+namespace API.Interfaces.Services
+{
+    public interface IScannerService
+    {
+        /// <summary>
+        /// Given a library id, scans folders for said library. Parses files and generates DB updates. Will overwrite
+        /// cover images if forceUpdate is true.
+        /// </summary>
+        /// <param name="libraryId">Library to scan against</param>
+        /// <param name="forceUpdate">Force overwriting for cover images</param>
+        void ScanLibrary(int libraryId, bool forceUpdate);
+
+        void ScanLibraries();
+    }
+}