Select single objects directly and click through selection

[Wumpf]

Centralizes how we compute instance hashes for picking!

We now ...

• if single instance always click/hover object path
• if multi instance click/hover object path
• if multi instance with anything under that object marked in any way as selected, click/hover concrete instance

Screen.Recording.2023-01-27.at.17.01.44.mov

The thing that sparked this: Can now select camera and directly manipulate image plane with less clicks:

Screen.Recording.2023-01-27.at.17.23.14.mov

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
• I've added a line to CHANGELOG.md (if this is a big enough change to warrant it)

[emilk]

So clicking once selects all instances, clicking again selects a single instance? How does that work with double-click?

EDIT: tested it, and double-clicking a point-cloud will select a single point and focus on it. It's fine.

Overall I like this interaction mode. Let's try it out for a few days and see how it feels.

[emilk]

Very nice!