request: interactive GUI for elements

[kyranet]

Is there an existing issue or pull request for this?

• I have searched the existing issues and pull requests

Feature description

Right now to place the boxes and circles, we are using sliders, which are outside of the canvas, and aren't as accurate or as fast as GUI elements the user can drag to move, resize, and rotate.

Desired solution

Add GUI elements the user can drag around, resize, and rotate.

Alternatives considered

One working project demonstrating this is available https://konvajs.org/docs/vue/Transformer.html

Additional context

Comments at #34.