Expression Evaluater (REPL support with inspector sequential results)

[LinqLover]

Note
This is a re-make of #60134 by @rohanrhu (see #60134 (comment)). I have no idea what I'm doing, I just ran git rebase. I did not compile or try anything out. All glory and expertise go to the original author.

[dalexeev]

Visual Script support was removed in 4.0.

[MewPurPur]

The old issue and its proposal aren't well-written and don't explain anything, although, they have a lot of support... I still don't really get what this is though. Could someone explain?

[LinqLover]

The old issue and its proposal aren't well-written and don't explain anything, although, they have a lot of support... I still don't really get what this is though. Could someone explain?

Well, in a nutshell, it should enable users to evaluate custom queries during debugging, and all evaluation results are displayed in a list. This is a common feature to many delivery, it improves interactivity and explorability, it would be great to see this in Godot, too.

[rohanrhu]

Dooooon't wooorry I'm back to the Godot Universe. I'll take care of all of my PRs sooon.

[Calinou]

I get the following error when building this PR rebased against the latest master branch:

editor\debugger\script_editor_debugger.cpp(41): fatal error C1083: 
Cannot open include : 'editor/debugger/editor_network_profiler.h' : No such file or directory

Changing the path in that file to modules\multiplayer\editor\editor_network_profiler.cpp resolvess the issue, but to fix this properly, it must have a #ifdef around it (as the multiplayer module may be disabled at build-time).

After making this change, it works when rebased on master :

The following errors are printed after evaluating the 4 lines in the above screenshot:

ERROR: Invalid named index 'this' for base type Object
   at: (core\math\expression.cpp:1507)
ERROR: Invalid named index 'this_does_not_exist' for base type Object
   at: (core\math\expression.cpp:1507)

This could be surfaced more obviously in the UI when on the Evaluator tab, as it's not obvious that a variable you're requesting does not exist (or there's a syntax error).

[KoBeWi]

Superseded by #97647
Thanks for your contribution nonetheless.