17.0.0

THIS UPDATE CONTAINS SUPPORT OF BOTS API 7.9

• Add support of subscriptions links handling
• Add support of info about sender chat. It is important, that for channels will be actual senderChat instead of
  from field due to User type of the last one. You also may use extensions Message.sender_chat or Any.withSenderChatMessageOrNull
  to access sender chat
• Add Reaction.Paid

Additional changes:

• Core:
  • Add top level interfaces OptionallyWithUser and OptionallyFromUser. Old WithUser and FromUser interfaces
    extending them with following overrides of user and from fields
• API:
  • Change order of delay and sending action in SendActionDSL
    (thanks to DRSchlaubi, PR #833).
    Besides, there has been changed way to create parallel sending of action and it must not lead to memory leaks anymore