Xtu Code

Cleaned up

Added build number to the applications version tag

Added a bridge XML schema as well. Test file validates OK.

Broken out application and domain schema in separate files. Also cleaned up a bit. the test file xtu.xml now validates OK.

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).