Lua API for manipulating the window layout

[Mm2PL]

Checklist

• I've verified that I'm running the most recent nightly build or stable release
• I've looked for my problem on the wiki
• I've searched the issues and pull requests for similar looking reports

Describe your issue

This API should be able to give plugins the ability to:

• open new tabs
• rename tabs
• move tabs around
• close tabs
• add/remove splits
• ideally also move splits between containers
• ideally also change the width and height constraints on splits
• get currently selected split, tab
• ideally also get the last selected window

The easy option seems to be presenting a tree of objects like:

Window
+-- Tab1
|   +-- SplitContainer1 (horizontal)
|       +-- SplitContainer1 (vertical)
|       |   +-- Split1
|       |   +-- SplitContainer2 (horizontal)
|       |       +-- Split2
|       |       +-- Split3
|       +-- SplitContainer3
|           ...
+-- Tab2
    ...

Which would correspond to something like:

I am still not convinced that this is the best way to achieve our goals because this will leak the internal structure of a window to plugins. Should we want to change that or clean it up somehow this API will be in the way.

Screenshots

No response

OS and Chatterino Version

Chatterino 2.5.2 DEBUG (commit 9afd605 modified) built with Qt 6.8.2 Running on Arch Linux, kernel: 6.13.2-arch1-1