Handle C++ exceptions properly

[alexhroom]

Currently workarounds are used (e.g. see the EditControls command) to handle crashes while C++ is handling Python code. These exceptions should be handled properly and the workarounds removed.

[StephenNneji]

I had a quick look at this issue, and it should be possible to catch an exception in a command by default, what we cannot do is propagate the exception, as exceptions in slots have undefined behaviour in QT (https://doc.qt.io/qtforpython-6/overviews/exceptionsafety.html#signals-and-slots), but I am adding a function to log the exceptions in #37

So It might be better to leave EditControls as it is because we will have to store and retrieve the exception from the command as it cannot be propagated

[alexhroom]

closing, then as exceptions are now properly logged but cannot be properly solved