Add marker end seconds import/export (#5777)

* skip importing markers if scene is skipped

pkg/models/jsonschema/scene.go

@@ -14,6 +14,7 @@ import (
 type SceneMarker struct {
 	Title      string        `json:"title,omitempty"`
 	Seconds    string        `json:"seconds,omitempty"`
+	EndSeconds string        `json:"end_seconds,omitempty"`
 	PrimaryTag string        `json:"primary_tag,omitempty"`
 	Tags       []string      `json:"tags,omitempty"`
 	CreatedAt  json.JSONTime `json:"created_at,omitempty"`