Scan refactor (#1816)

* Add file scanner
* Scan scene changes
* Split scan files
* Generalise scan
* Refactor ffprobe
* Refactor ffmpeg encoder
* Move scene scan code to scene package
* Move matchExtension to utils
* Refactor gallery scanning
* Refactor image scanning
* Prevent race conditions on identical hashes
* Refactor image thumbnail generation
* Perform count concurrently
* Allow progress increment before total set
* Make progress updates more frequent

pkg/ffmpeg/encoder_screenshot.go

@@ -28,7 +28,7 @@ func (e *Encoder) Screenshot(probeResult VideoFile, options ScreenshotOptions) e
 		"-f", "image2",
 		options.OutputPath,
 	}
-	_, err := e.run(probeResult, args)
+	_, err := e.run(probeResult.Path, args, nil)
 
 	return err
 }