Custom Target Expressions

[aurceive]

Describe your changes

I added support for custom target expressions and a convenient editor.

Since the last PR I have found at least one indisputably correct way to use CTE.

Example: https://discord.com/channels/785153694478893126/1035719815622561892/1244630283052126298
Another example: https://discord.com/channels/785153694478893126/1035720633167921313/1237378233666633850

Testing/validation

The optimizer sometimes refuses to work with some large expressions. Like this:

This can be bypassed by slightly changing the form of the expression without changing the essence.

Also, this case is calculated incorrectly. Although when it is used as part of a larger expression, it is calculated as expected.

I can't fix it. It's an engine issue. I preferred to forget about it until the transition to Pando.

Checklist before requesting a review (leave this PR as draft if any part of this list is not done.)

• I have commented my code in hard-to understand areas.
• I have made corresponding changes to README or wiki.
• For front-end changes, I have updated the corresponding English translations.
• I have run yarn run mini-ci locally to validate format and lint.
• If I have added a new library or app, I have updated the deployment scripts to ignore changes as needed

[aurceive]

I don't know why, but since this PR was published I have never encountered the optimizer refusing to work when I used CTE.
I also checked the example of the incorrect calculation, now it returns the expected result.

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✨ Finishing touches

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