Xtu Code

Added referential integrity constraint for valid state and event names in transition rules-section of FSM

Added unique keys for states and events in the FSM as well as referential integrity for selecting valid initial_state of an FSM

Separated FSM-schema into a file of its own. Broken out util types into a separate name space. Relocated old schemas.

Added new xUML description model, new XML schema as well as test file.

Updated Catch2 to version 2.13.10 (from 2.13.09).
Cleaned up the PoolT template. simplified its algorithm, reduced code and improved performance about 10%.
Updated tests according with changes to PoolT.

Added a benchmark test (49_05) for Asynch ZMQ requesr-reply. Also fixed an error in testcase 49_04, which didn't use asynch communication everywhere (used synch instead).

Fixed and finished test 49_04 (working)

Added a test (TEST_CASE_49_04) for asynch communication using the ZmqTxRx-class. Also fixed some bugs in ZmqTxRx.

In addition. Time out-handling (or response thereto) needs to be moved from ZmqTxRx to to the comm scheduler's state machine.

Added a benchmark test for synchronous Req-Rep communication over ZMQ. Also made some minor clean-up after running code checker.

Added a fully functional, synchronous socket, Request-Reply cycle to test 49_02.