[Files Refactor] Import export fixup (#2763)

* Adjust json schema
* Remove mappings file from export
* Import file/folder support
* Update documentation
* Make gallery filenames unique

pkg/models/jsonschema/image.go

@@ -8,28 +8,33 @@ import (
 	"github.com/stashapp/stash/pkg/models/json"
 )
 
-type ImageFile struct {
-	ModTime json.JSONTime `json:"mod_time,omitempty"`
-	Size    int64         `json:"size"`
-	Width   int           `json:"width"`
-	Height  int           `json:"height"`
-}
-
 type Image struct {
 	Title      string        `json:"title,omitempty"`
-	Checksum   string        `json:"checksum,omitempty"`
 	Studio     string        `json:"studio,omitempty"`
 	Rating     int           `json:"rating,omitempty"`
 	Organized  bool          `json:"organized,omitempty"`
 	OCounter   int           `json:"o_counter,omitempty"`
-	Galleries  []string      `json:"galleries,omitempty"`
+	Galleries  []GalleryRef  `json:"galleries,omitempty"`
 	Performers []string      `json:"performers,omitempty"`
 	Tags       []string      `json:"tags,omitempty"`
-	File       *ImageFile    `json:"file,omitempty"`
+	Files      []string      `json:"files,omitempty"`
 	CreatedAt  json.JSONTime `json:"created_at,omitempty"`
 	UpdatedAt  json.JSONTime `json:"updated_at,omitempty"`
 }
 
+func (s Image) Filename(basename string, hash string) string {
+	ret := s.Title
+	if ret == "" {
+		ret = basename
+	}
+
+	if hash != "" {
+		ret += "." + hash
+	}
+
+	return ret + ".json"
+}
+
 func LoadImageFile(filePath string) (*Image, error) {
 	var image Image
 	file, err := os.Open(filePath)