Feature: Dart Tool

[GraceDM]

Describe the new feature you would like to see in Seamly

Would it be possible/feasable to have a dart tool that will create a dart by selecting a start/end point of a line where the dart will be placed and then clicking on the 2 points of the half-width of the dart, and based on the asinD() function, both sides of the dart are automatically created?

Perhaps there's a better way of aautomatically creating a dart than the asinD() function that I don't know about?

I forsee that this method will work with waist darts, however, I'm not too sure how it will work with neck or shoulder darts.