[api] Support v6.0

[ex0ns]

https://core.telegram.org/bots/api#april-16-2022

• Added support for Web Apps, see the detailed manual here. (blog announcement)
• Added the class WebAppInfo and the fields web_app to the classes KeyboardButton and InlineKeyboardButton.
• Added the class SentWebAppMessage and the method answerWebAppQuery for sending an answer to a Web App query, which originated from an inline button of the 'web_app' type.
• Added the class WebAppData and the field web_app_data to the class Message.
• Added the class MenuButton and the methods setChatMenuButton and getChatMenuButton for managing the behavior of the bot's menu button in private chats.
• Added the class ChatAdministratorRights and the methods setMyDefaultAdministratorRights and getMyDefaultAdministratorRights for managing the bot's default administrator rights.
• Added support for t.me links that can be used to add the bot to groups and channels as an administrator.
• Added the field last_synchronization_error_date to the class WebhookInfo.
• Renamed the field can_manage_voice_chats to can_manage_video_chats in the class ChatMemberAdministrator. The old field will remain temporarily available.
• Renamed the parameter can_manage_voice_chats to can_manage_video_chats in the method promoteChatMember. The old parameter will remain temporarily available.
• Renamed the fields voice_chat_scheduled, voice_chat_started, voice_chat_ended, and voice_chat_participants_invited to video_chat_scheduled, video_chat_started, video_chat_ended, and video_chat_participants_invited in the class Message. The old fields will remain temporarily available.