Editing Built-in Timeline resources

[VeliaArcus]

Is your feature request related to a problem? Please describe.
In the Godot editor, one can create export variables of the Dialogic Timeline type. Like most resources, you can create a new built-in timeline resource for each variable in the inspector. However, there is no way to edit these resources in either the visual or text Dialogic editors.

Describe the solution you'd like
Add the ability to edit these built-in resources. If you click on a timeline resource variable in the inspector, the Dialogic window will open and allow you to edit it just like an external timeline.

This way, a user can create many short timelines without needing to clutter the file system with hundreds of tiny timeline files with unique names. This could potentially be very useful for adding small snippets of dialogue to a large number of NPCs, for example.

Describe alternatives you've considered
This idea initially came to mind because I wanted to use Dialogic in conjunction with the animation player to create complex cutscenes. However, this became very tedious as the timeline had to be saved in an external file and not the animation itself, meaning that the cutscene could easily become desynced.

If Dialogic could edit built-in timelines, it would solve my problem. I could use a Call Method keyframe for a function and pass a built-in timeline as an argument, which would tie the timeline directly to the animation and not require external files or synchronisation.

I personally think that this feature could benefit many users, as it creates a more streamlined workflow when creating cutscenes in the vein of RPG maker and the like.