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/friends.go

@@ -0,0 +1,63 @@
+package object // import "github.com/SevereCloud/vksdk/v2/object"
+
+// FriendsFriendStatus FriendStatus type.
+const (
+	FriendsStatusNotFriend        = iota // not a friend
+	FriendsStatusOutComingRequest        // out coming request
+	FriendsStatusInComingRequest         // incoming request
+	FriendsStatusIsFriend                // is friend
+)
+
+// FriendsFriendStatus struct.
+type FriendsFriendStatus struct {
+	FriendStatus   int         `json:"friend_status"`
+	ReadState      BaseBoolInt `json:"read_state"`      // Information whether request is unviewed
+	RequestMessage string      `json:"request_message"` // Message sent with request
+	Sign           string      `json:"sign"`            // MD5 hash for the result validation
+	UserID         int         `json:"user_id"`         // User ID
+}
+
+// FriendsFriendsList struct.
+type FriendsFriendsList struct {
+	ID   int    `json:"id"`   // List ID
+	Name string `json:"name"` // List title
+}
+
+// type friendsMutualFriend struct {
+// 	CommonCount   int   `json:"common_count"` // Total mutual friends number
+// 	CommonFriends []int `json:"common_friends"`
+// 	ID            int   `json:"id"` // User ID
+// }
+
+// FriendsRequests struct.
+type FriendsRequests struct {
+	UsersUser
+	From      string                `json:"from"` // ID of the user by whom friend has been suggested
+	Mutual    FriendsRequestsMutual `json:"mutual"`
+	UserID    int                   `json:"user_id"` // User ID
+	TrackCode string                `json:"track_code"`
+}
+
+// FriendsRequestsMutual struct.
+type FriendsRequestsMutual struct {
+	Count int   `json:"count"` // Total mutual friends number
+	Users []int `json:"users"`
+}
+
+// FriendsRequestsXtrMessage struct.
+type FriendsRequestsXtrMessage struct {
+	FriendsRequests
+	Message string `json:"message"` // Message sent with a request
+}
+
+// FriendsUserXtrLists struct.
+type FriendsUserXtrLists struct {
+	UsersUser
+	Lists []int `json:"lists"` // IDs of friend lists with user
+}
+
+// FriendsUserXtrPhone struct.
+type FriendsUserXtrPhone struct {
+	UsersUser
+	Phone string `json:"phone"` // User phone
+}