Multi cursor visual effect

[ZacZhangzhuo]

What type of change is this?

• [x] Multi-cursor visual effect when doing rotating or panning.

Checklist

• [x] I added a line to the CHANGELOG.md file in the Unreleased section under the most fitting heading (e.g. Added, Changed, Removed).
• [x] I ran all tests on my computer and it's all green (i.e. invoke test).
• [x] I ran lint on my computer and there are no errors (i.e. invoke lint).

[ZacZhangzhuo]

https://github.com/compas-dev/compas_view2/issues/174