Merge #16674: refactor: remove obsolete qt algorithm usage

153d9dd9acffa95bb97a4b1579bd20237fdc9c52 refactor: replace qLowerBound & qUpperBound with std:: upper_bound & lower_bound (fanquake)
59373e3e94015316bcaa03a7b9c2e6f442641720 refactor: replace qSort with std::sort (fanquake)
fea33cbbdfb4673033f3414bf1613591ff654aac refactor: replace qStableSort with std::stable_sort (fanquake)

Pull request description:

  `qStablesort`, `qSort`, `qLowerBound` and `qUpperBound` have been marked as obsolete since at least Qt 5.9: [Obsolete Members for QtAlgorithms](https://doc.qt.io/qt-5.9/qtalgorithms-obsolete.html).

  This pull request replaces their usage with the suggested `std::` replacements.

  This also removes some warning spam when compiling against newer Qt (5.13.0 via brew):
  ```bash
    CXX      qt/libbitcoinqt_a-walletcontroller.o
  qt/transactiontablemodel.cpp:96:52: warning: 'qLowerBound<QList<TransactionRecord>::iterator, uint256, TxLessThan>' is deprecated: Use std::lower_bound [-Wdeprecated-declarations]
          QList<TransactionRecord>::iterator lower = qLowerBound(
  qt/transactiontablemodel.cpp:98:52: warning: 'qUpperBound<QList<TransactionRecord>::iterator, uint256, TxLessThan>' is deprecated: Use std::upper_bound [-Wdeprecated-declarations]
          QList<TransactionRecord>::iterator upper = qUpperBound(
  ```

  ```bash
    CXX      qt/libbitcoinqt_a-moc_walletcontroller.o
  qt/bantablemodel.cpp:64:13: warning: 'qStableSort<QList<CCombinedBan>::iterator, BannedNodeLessThan>' is deprecated: Use std::stable_sort [-Wdeprecated-declarations]
              qStableSort(cachedBanlist.begin(), cachedBanlist.end(), BannedNodeLessThan(sortColumn, sortOrder));
  ```

  ```bash
    CXX      qt/libbitcoinqt_a-sendcoinsentry.o
  qt/recentrequeststablemodel.cpp:205:5: warning: 'qSort<QList<RecentRequestEntry>::iterator, RecentRequestEntryLessThan>' is deprecated: Use std::sort [-Wdeprecated-declarations]
      qSort(list.begin(), list.end(), RecentRequestEntryLessThan(column, order));
  ```

ACKs for top commit:
  hebasto:
    ACK 153d9dd9acffa95bb97a4b1579bd20237fdc9c52
  promag:
    ACK 153d9dd9acffa95bb97a4b1579bd20237fdc9c52.
  jonasschnelli:
    utACK 153d9dd9acffa95bb97a4b1579bd20237fdc9c52

Tree-SHA512: 22f7290ed798ce8b0f5f313405377845d4c8e48dc8687be7464e27fff53363b451a40e9e18910a8c3b4b9d4dcc236a366c92e7d171fcb8576c48f149a1886c26

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