add function to get EditorScript text area

[JeffVenancius]

Lately I was thinking about creating a plugin for the script editor.
Coming from vim, I can see how good it can be to have a code editor that can be customizable to the core, so anyway, I was trying to get the textEdit inside so I could mess with it and I've found pretty difficult.

For those who don't know, to get the textEdit inside the code editor one should get a tabContainer, this tabContainer holds not only textEditors, but a helper (when you're reading docs inside the editor),

Because you need to access it from this tabContainer, you can't use a simple get_node(), instead, you can only get it by get_current_tab_control().

Well, simply put, I think we all could use something like get_text_area() inside the EditorScript class, it would simplify things and it would bring more possiblities for the comunity.

As I've said, I come from vim, so I know how many ways one can customize how you edit text and how it can help you make better code and less mistakes.