Add a way to expand the code editor portion of the layer interface

[justenPalmer]

No description provided.

[PetersonGIS]

Also, it might be nice to have the code editor panel be a separable object that you can drag to another screen. If possible. The ability to hide the editor would also be a good thing. Right now a new user is bound to click the back arrow, thinking it will hide the code editor, but instead it takes them to the initial screen.

[PetersonGIS]

Perhaps also related, the scroll bar at the bottom of the editor is very hard to grab.

[justenPalmer]

The code editor on dev now has an autogrow feature which allows it to grow vertically to accommodate larger JSON documents. It still doesn't fix the horizontal scaling issue but is an improvement