[3.x] Improve and streamline VisualScriptFuncNodes Call Set Get

[Gallilus]

This PR improves and streamlines the workflow for VisualScriptFunctionNodes Call Set Get
Uniform design.
Drag in set-get from tree is now working.

3.x version of #49749

Controlsgc.zip

Compatibility whit older scripts is NOT guaranteed as I added the pass output port for get instance.
I do want to note that the other changes is are a real big improvement to the UX

[akien-mga]

Compatibility whit older scripts is NOT guaranteed as I added the pass output port for get instance.

We need to make sure that scripts created in Godot 3.3 can still be opened in Godot 3.4, otherwise users would lose work (it's a binary format so if it's incompatible, it will just been seen as corrupt and they won't be able to open it).

[Gallilus]

I don't think the binary wil complain, think the logic wil use pass_object opose to the value.
This evening I wil do some test.
Worst case scenario we leave pass out of it.

[Gallilus]

Tested
New project in version 3.3.2

Opened in version 0ab6495

Working as you would expect. And In the past there where now issues with opening scripts between builds.

[akien-mga]

I'm not familiar with the pass concept but in that second screenshot, shouldn't the print node get its value from position instead of pass?

[Gallilus]

Exactly that is the compatibility error.
So I am already reverting this pass change the push wil be tomorrow.
Goodnight.

[Gallilus]

Now its backwards compatible.
Left a few "// port 'pass' not backported to 3.x to keep script backwards compatibility" in there so the next person wil not wast time.

[akien-mga]

Thanks!