Kit Bishop

I split the commit into two parts: - Selection overhaul - includes changes to selection, mouse handling, set_caret_line -1, and goto line changes. - Multicaret edit overhaul - includes multicaret...

Fixed failing check and added collapse tests.

>Yeah can't expose Vector, have convert it to a TypedArray to do that. If I use a TypedArray, I think I won't be able to use ranged for each loops...

Rebased to fix minor merge conflicts and update to new deprecated doc style. Also, I think I can split off a few more things into separate PRs so its easier...

Rebased to fix conflicts (#88474). I removed the [save multiple carets state](https://github.com/godotengine/godot/issues/86863#reload-scripts) and the [goto line changes](https://github.com/godotengine/godot/issues/86863#goto-line), since I wanted to make some changes to them and they can be...

> Going to chime in and say that this would also fix https://github.com/godotengine/godot/issues/76093 This doesn't actually fix https://github.com/godotengine/godot/issues/76093. This PR should fix all other issues that were fixed in https://github.com/godotengine/godot/pull/73580,...

- Rebased and fixed minor conflicts after https://github.com/godotengine/godot/pull/85325. - Added https://github.com/godotengine/godot/issues/89417 to the fix list.

Rebased to fix conflicts. Removed args for `set_line` and `swap_lines` so they don't break compat, and other suggestions. - Edit: added https://github.com/godotengine/godot/issues/90462 to the fix list

rebased to fix merge conflicts

Rebased to fix merge conflict. > vector constructor Variant already has constructors for Packed*Array and a few other Vectors including `Vector`, so Array doesn't need its own constructor for it....