ProMotion 2.0 Prelim Pull Request

[x] Update documentation (https://github.com/clearsightstudio/ProMotion/wiki)
[x] Create a migration guide (https://github.com/clearsightstudio/ProMotion/wiki/Migration-Guide:-ProMotion-1.2-to-2.0)
[ ] Merge this
[ ] Publish public beta `2.0.0.rc1`
[ ] Resolve any outstanding issues
[ ] Release 2.0.0
[ ] Update project template