Changes

Renamed system tests to integration tests.
Added integration test to verify proper handling of bad "start writing" messages.
Writer module attributes will now be ignored. If you want to set attributes of a parent group, do so directly.
Prioritisation has changed such that the NX_class of a parent group to a file-writer module will only be set if no such attribute is already set.
All the dependencies have been updated to their latest (conan) version as of 2022-05-23. This has required some changes and bug fixes in the application.

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