This does now mean we do a lot more re-ordering of the list,
but the alternative is to keep two lists which would more easily
become out of sync.

This applies to any PandA field that returns us a label field.
Tests updated to accomodate this.

Also fixes some mypy errors in tests

Also upgrade to newest pythonSoftIoc which includes waveform of
strings support.
Also adjust typing of some test fixtures to better indicate that
the order of items is important

Also raise exception if initial connect fails.

Also improves the IOC startup, by waiting for a signal rather than
just a flat sleep timer