MRG: Make Inspector work even if mne-qt-browser is installed #1007
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We now explicitly request a Matploblib plotting context for bringing up the Inspector. Otherwise, MNE will default to
using the qt-browser if installed, and our current implementation of the Inspector will fail to launch.
This didn't show up in unit tests before as we're using the Agg backend there.
Merge checklist
Maintainer, please confirm the following before merging: