[Feature Request] Add button to open pair list in MM

[ryanbugden]

Often when using Touché, I'm already kerning in MetricsMachine, so it'd be super convenient if instead of:

1. Export Pairlist
2. Go to MM
3. Load Pairlist
4. Delete file

You could just have a button that puts the pairlist directly into MM. Code would be pretty simple:

import metricsMachine

metricsMachine.SetPairList(pair_list)