Sphinx v3.0 incompatible to Breathe plugin
Summary
Sphinx v3.0 was released today and the current version of the Breathe plugin (rendering Doxygen docs in Sphinx) seems to be incompatible to it.
Steps to reproduce
Re-build the project and call make doc.
What is the current bug behaviour?
Building the Sphinx documentation fails.
What is the expected correct behaviour?
Building the Sphinx documentation passes.
Relevant logs, screenshots, files...?
See the log of a recent build job.
Ideas how to fix this?
Limit Sphinx version to <3.0 for now.
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