v0.9

Changes:

• Add TFM median (arim.im.tfm.tfm_for_view(..., aggregation="median"))
• Add arim.datasets to automatically fetch test datasets
• Add unfinished forward model for contact inspection
• Better example scripts, bundled with test data
• replace "scanline" (coming from old specs of MFMC) with the more understandable "timetrace"

Internal changes:

• Add MIT licence
• Add continuous integration using GitHub Action
• Improve CONTRIBUTING guide