Feature request: Sticking connectors

[xairy]

Would be great to allow arrow connectors to stick to other slide elements (shapes, text boxes, etc.).

This can work by adding 8 sticking points to the bounding box of each element (top left corner, top middle, top right corner, middle right, bottom right corner, etc.) and then allowing either side of the connector to stick to those points when dragging the connector end with a mouse. And when an element with a sticked-on connector gets moved, the connector gets adjusted accordingly.

This is extremely useful for creating diagrams. Google Slides have this feature (except they don't allow sticking to corners, AFAIR).