clean up optional mpl imports in tests

Merge pull request #353 from fooof-tools/medae

[ENH] - Add median absolute error

Release candidate - internal reorganization

Merge pull request #283 from fooof-tools/time

[ENH] - Add `SpectralTimeModel` and `SpectralTimeEventModel`

Merge pull request #205 from fooof-tools/name

[MNT] - Name update for new version

version bump to 1.1

Tweaks for release

add doc note about simulating gaussians outside simulated freq range

Update description in setup

Lint: fix line length