Add live template for config section

The pre-defined live templates are a great feature! A template which shows examples for the various config attributes of AsciiDoc could be helpfull since it is hard to remember them all. Maybe we could cluster them:

ad-config-i18n
:caution-caption: Caution
:important-caption: Important
:note-caption: Note
:tip-caption: Tip
:warning-caption: Warning
:appendix-caption: Appendix
:example-caption: Example
:figure-caption: Figure
:table-caption: Table
:toc-title: Table of Contents

ad-config-toc
:toc-title: Table of Contents
:toc-placement: auto
:toclevels: 4
:sectnums:
:sectnumlevels: 2
:sectanchors:
:sectids:
:sectlinks:

ad-config-pdf
:pdf-page-size: A4
:pdf-stylesdir: ../pdfTheme

ad-config-render
:icons: font
:imagesdir: images
::doctype: book

I guess the change has to be applied to https://github.com/asciidoctor/asciidoctor-intellij-plugin/blob/master/src/main/resources/liveTemplates/AsciiDocLiveTemplates.xml

[ahus1]

I suppose ad-config-i18n and ad-config-toc would be the two most useful. I am not sure about the other two.

I suggest adding line comments explaining each option to the user. The user can later remove the comments if they don’t need them any more (there is Ctrl+Q to look up the docs for each attribute but not everyone knows about this).

[mojavelinux]

You probably want to add partnums if you’re adding sectnums.