add tab title rename logic

[Lemonbrush]

I added tab title rename logic
It allows you to rename tabs without affecting tab node paths as it is now
To be honest, this solution looks bad. If you have an advice on haw to improve it I would be happy to make an update but now it is something at least

[gilzoide]

Hey @Lemonbrush, thanks for the contribution!
Renaming tabs is a very nice addition, much needed if you ask me.

If you have an advice on haw to improve it I would be happy to make an update but now it is something at least

I think tab naming should be kept in the DockableLayout resource instead of the DockableContainer. This way it would be easily editable without any code and would get properly serialized.

Not sure if it makes more sense to put this in the DockableLayout itself, like hidden_tabs is, or if it makes sense to put this in the DockableLayoutPanel. I guess the first option is better, because one could rearrange the panels several times and the name mapping would be kept in the same place, much simpler.
What do you think?