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/manager/exclude_files.go

@@ -1,7 +1,6 @@
 package manager
 
 import (
-	"path/filepath"
 	"regexp"
 	"strings"
 
@@ -86,14 +85,3 @@ func matchFileSimple(file string, regExps []*regexp.Regexp) bool {
 	}
 	return false
 }
-
-func matchExtension(path string, extensions []string) bool {
-	ext := filepath.Ext(path)
-	for _, e := range extensions {
-		if strings.EqualFold(ext, "."+e) {
-			return true
-		}
-	}
-
-	return false
-}