Added the auto indent setting.

[bognaum]

Hello @dannyconnell.

I often work with different types of indents, and it is quite not convenient to constantly change the settings, moving from the project to the project.

I propose the opportunity to set the automatic determination of the indent type depending on the editor options by using the editor.options.tabSize and the editor.options.insertSpaces APIs. I also left the opportunity to set the custom indent.

I think it will be more convenient.