Add vk bridge (#1372)

* Add vk bridge

* Vk bridge attachments

* Vk bridge forwarded messages

* Vk bridge sample config and code cleanup

* Vk bridge add vendor

* Vk bridge message edit

* Vk bridge: fix fetching names of other bots

* Vk bridge: code cleanup

* Vk bridge: fix shadows declaration

* Vk bridge: remove UseFileURL

vendor/github.com/SevereCloud/vksdk/v2/object/appwidgets.go

@@ -0,0 +1,20 @@
+package object
+
+// AppWidgetsAppImageUploadResponse struct.
+type AppWidgetsAppImageUploadResponse struct {
+	Image string `json:"image"`
+	Hash  string `json:"hash"`
+}
+
+// AppWidgetsGroupImageUploadResponse struct.
+type AppWidgetsGroupImageUploadResponse struct {
+	Image string `json:"image"`
+	Hash  string `json:"hash"`
+}
+
+// AppWidgetsImage struct.
+type AppWidgetsImage struct {
+	ID     string      `json:"id"`
+	Type   string      `json:"type"`
+	Images []BaseImage `json:"images"`
+}