Merge bitcoin-core/gui#581: refactor: Revamp `ClientModel` code to handle core signals

bcbf982553aba8107fdb0db413d4b9fe8adc8f17 qt, doc: Remove unneeded comments (Hennadii Stepanov)
9bd1565f6501c81291b286cdfaecd0daf8981c75 qt: Revamp ClientModel code to handle {Block|Header}Tip core signals (Hennadii Stepanov)
48f6d39659e40f44907a7c09f839df988e6c6206 qt: Revamp ClientModel code to handle BannedListChanged core signal (Hennadii Stepanov)
36b12af7eeb571efccd972b2f732a81ae7310066 qt: Revamp ClientModel code to handle AlertChanged core signal (Hennadii Stepanov)
bfe5140c50d16cc995c7da458d38759b68e9cbe6 qt: Revamp ClientModel code to handle NetworkActiveChanged core signal (Hennadii Stepanov)
639563d7fea6b4d65840625dc466eede32d893cf qt: Revamp ClientModel code to handle NumConnectionsChanged core signal (Hennadii Stepanov)
508e2dca5e91c1ff921f01d260fc62f629f1dc9e qt: Revamp ClientModel code to handle ShowProgress core signal (Hennadii Stepanov)

Pull request description:

  This PR:
  - is a pure refactoring with no behavior change
  - gets rid of `QMetaObject::invokeMethod()` "dynamic" calls, i.e., without compile-time checks of a called function name and its parameters
  - replaces `std::bind`s with lambdas, making parameter permutation (including parameter omitting) explicit
  - makes code simpler, more concise, and easier to reason about

  Additionally, debug messages have been unified.

ACKs for top commit:
  promag:
    Code review ACK bcbf982553aba8107fdb0db413d4b9fe8adc8f17
  w0xlt:
    tACK https://github.com/bitcoin-core/gui/pull/581/commits/bcbf982553aba8107fdb0db413d4b9fe8adc8f17 on Ubuntu 21.10, Qt 5.15.2.

Tree-SHA512: 35f62b84f916b3ad7442f0fea945d344b3c448878b33506ac7b81fdf5e49bd2a82e12a6927dc91f62c335487bf2305cc45e2f08985303eef31c3ed2dd39e1037

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