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/gifts.go

@@ -0,0 +1,34 @@
+package object // import "github.com/SevereCloud/vksdk/v2/object"
+
+// GiftsGift Privacy type.
+const (
+	GiftsGiftPrivacyForAll        = iota // name and message for all
+	GiftsGiftPrivacyNameForAll           // name for all
+	GiftsGiftPrivacyRecipientOnly        // name and message for recipient only
+)
+
+// GiftsGift struct.
+type GiftsGift struct {
+	Date     int         `json:"date"`    // Date when gist has been sent in Unixtime
+	FromID   int         `json:"from_id"` // Gift sender ID
+	Gift     GiftsLayout `json:"gift"`
+	GiftHash string      `json:"gift_hash"` // Hash
+	ID       int         `json:"id"`        // Gift ID
+	Message  string      `json:"message"`   // Comment text
+	Privacy  int         `json:"privacy"`
+
+	Description string `json:"description"`
+	PaymentType string `json:"payment_type"`
+	Price       int    `json:"price"`
+	PriceStr    string `json:"price_str"`
+}
+
+// GiftsLayout struct.
+type GiftsLayout struct {
+	ID                int         `json:"id"`
+	Thumb256          string      `json:"thumb_256"` // URL of the preview image with 256 px in width
+	Thumb48           string      `json:"thumb_48"`  // URL of the preview image with 48 px in width
+	Thumb96           string      `json:"thumb_96"`  // URL of the preview image with 96 px in width
+	StickersProductID int         `json:"stickers_product_id"`
+	IsStickersStyle   BaseBoolInt `json:"is_stickers_style"`
+}