how to remove packages using editor script

[unitycoder]

references

• https://forum.unity.com/threads/solved-removing-packages-in-an-editor-script.697061/#post-4669562

[unitycoder]

currently works in 2020.3 and later, using newtonsoft from reflection.

later, need to add simple string parsing to remove packages in older versions.

[unitycoder]

for 2019.1 and later have:
https://docs.unity3d.com/2019.1/Documentation/Manual/upm-api.html

[unitycoder]

kind of works already, so maybe improve later