Add Handy / Funscript support (#1377)

* Add funscript route to scenes

Adds a /scene/:id/funscript route which serves a funscript file, if present.

Current convention is that these are files stored with the same path, but with the extension ".funscript".

* Look for funscript during scan

This is stored in the Scene record and used to drive UI changes for funscript support.

Currently, that's limited to a funscript link in the Scene's file info.

* Add filtering and sorting for interactive
* Add Handy connection key to interface config
* Add Handy client and placeholder component.

Uses defucilis/thehandy, but not thehandy-react as I had difficulty integrating the context with the existing components.

Instead, the expensive calculation for the server time offset is put in localStorage for reuse.

A debounce was added when scrubbing the video, as otherwise it spammed the Handy API with updates to the current offset.

ui/v2.5/src/components/Scenes/SceneDetails/SceneFileInfoPanel.tsx

@@ -232,6 +232,19 @@ export const SceneFileInfoPanel: React.FC<ISceneFileInfoPanelProps> = (
     }
   }
 
+  function renderFunscript() {
+    if (props.scene.interactive) {
+      return (
+        <div className="row">
+          <span className="col-4">Funscript</span>
+          <a href={props.scene.paths.funscript ?? ""} className="col-8">
+            <TruncatedText text={props.scene.paths.funscript} />
+          </a>{" "}
+        </div>
+      );
+    }
+  }
+
   return (
     <div className="container scene-file-info">
       {renderOSHash()}
@@ -239,6 +252,7 @@ export const SceneFileInfoPanel: React.FC<ISceneFileInfoPanelProps> = (
       {renderPhash()}
       {renderPath()}
       {renderStream()}
+      {renderFunscript()}
       {renderFileSize()}
       {renderDuration()}
       {renderDimensions()}