Remove remaining pieces that depend on Poppler #35
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This most obviously includes the Poppler backend, but also the EPS exporter.
As discussed under #32, there is currently no python-poppler-qt6, and little interest in creating one now that QtPdf satisfies our needs. It would therefore make sense to drop Poppler support rather than continue to include a feature we do not need using a binding we do not control.
This PR is mutually exclusive with #33 and intended to follow frescobaldi/frescobaldi#1832, which removes the last Poppler-dependent features from Frescobaldi.