Proper new node placement

[farmaazon]

If done before #8054, just the functions returning position should be implemented.

It should be implemented as in the old design, except the following:

1. The "Previous node dictated placement" should look for place to the right, not to the left
2. "Mouse pointer dictated placement" should work differently, as previously it gave a very bad UX. May be always create node as pointed position (as eventually in the old GUI), or other improvements may be discussed.

[enso-bot]

E-Hern Lee reports a new STANDUP for yesterday (2023-10-20):

Progress: - tests

• lots of debugging and bugfixes
• big refactor It should be finished by 2023-10-27.

Next Day: (hopefully) finish new node placement (only one test should be left), do bookclub

[enso-bot]

E-Hern Lee reports a new STANDUP for yesterday (2023-10-23):

Progress: - finish implementing

other issues -

• merge demo scenes, basic testing with building static site
• investigate issue with broken font paths on website2 It should be finished by 2023-10-27.

Next Day: website2 things, reading custom visualizations (+ potentially refactors to viz compiler - currently it fetches dependencies), actually do bookclub...

[enso-bot]

E-Hern Lee reports a new STANDUP for yesterday (2023-10-24):

Progress: - (wip) address issues

• minor issues are addressed locally
• the tests need quite major refactors
• one file is also still missing tests

other issues -

• (8077, no PR yet) initial implementation for loading custom visualizations (logic mostly done? this includes refactors to viz compiler). current status: working on subscribing to file updates It should be finished by 2023-10-27.

Next Day: finish addressing issues, attempt to finish loading custom visualizations, i can probably actually do bookclub tomorrow