paho-mqtt-cpp: Upgrade 1.4.1 -> 1.5.3

Upgrade to release 1.5.3:

- Fix the bundled Paho C build foc C23 compilers by forcing C99
  compliance in CMake build
- Code base updated to to C++17
- Now a C++17 compiler is required to compile the library
- CMake minimum required version raised to v3.13
- Need a fairly recent CMake for C++17 support (>= v3.12)
- CMake v3.13 allows INSTALL(TARGETS) to work outside the current
  directory.
- Clients always created for v5 persistence format, making it
  universal for any connection.
- If the application specifies a version it is kept as a hint for
  default connections.
- The version for the connection should be specified in the connect
  options.
- The create_options now have all the parameters to create a client.
- Can specify Server URL, Client ID, and persistence in the create
  options.
- New client constructor that takes just the options object
- The client caches a const create_options struct with all the
  creation parameters
- Client creation internally simplified without breaking the public
  API
- Expanded the message constmer to be a full client "event" consumer.
- The events are for connected, connection_lost, disconnected,
  message arrived, and application shutdown.
- The application can get client state change notifications without
  resorting to callbacks.
- There's a new persistence_type (std::variant) that can hold any
  of the persistence specifiers (none, file directory, or user
  interface).
- Most of the class static constants are now constexpr.
- Removed the fake ReasonCode::MQTTPP_V3_CODE. Now all reason codes
  in a v3 connection are SUCCESS.
- The mqtt::exception checks if the 'rc' return code actually
  contains a reason code error, amd if so, sets it as the reason
  code.
- property can now report the typeid of its contained value.
- The properties list implements a const iterator
- Added a to_string() and operator<<() for reason codes.
- thread_queue is now closable.
- Added documentation for UNIX domain sockets coming in with Paho
  C v1.3.14
- Removed the manual implementation of make_unique<>()
- Added create_options assignment operators.
- Fixed some corner cases for topic_filter::matches()
- Cleaned up and fixed a number of example apps.
- Most apps now except a server URI from the command line
- 'data_publish' example uses C++17 std::filesystem for creating
  a file-based encrypted persistence for messages.
- Updated local CI (buildtst.sh) for current compilers and unit tests.
- Reorganized the source repository
- Completely reformat the sources and added a .clang-format file (a
  project master and a slightly-different one for headers).

Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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