Update to resilient v4.x

[Omikhleia]

Greetings,

In resilient.sile v3.x and v4.x some components were changed (e.g. fancytoc), and an attempt at compiling this book with the updated module raises an error.
There are also a number of things that are available out-of-the-box (e.g. frontmatter), avoiding the need to use SIL escapes.

If you don't mind, I'll open a PR here and propose the changes -- at the same time as I tried a minimal update just to see what it would give here, I found a few bugs in resilient v4.0, for which a workaround is easy, but that's a good occasion for me to fix them in a v4.1 🐱

[ul]

The update is more than welcome, thank you so much for going through the trouble to make it. Please let me know whether you want to merge minimal changes with the workaround first, or do everything in one go once 4.1 is out. I'm happy with either, as long as the code on master compiles into a beautiful book!

[Omikhleia]

The minimal workaround is easy, and I see you have done it actually, in the master document

• load packages.resilient.fancytoc instead of packages.fancytoc
• have a non-empty sile.options node

... thank you so much for going through the trouble to make it

You are welcome. I tend to always use the same type of master document for my own books, so I wouldn't have seen the small bugs (with an empty sile.options node, with a frontmatter block) if I hadn't tried, likely ;)

[ul]

The minimal workaround is easy, and I see you have done it actually, in the master document

Interesting that I had to apply it to make it work with 3.4.0! Edit: silly me, I just realised that you explicitly mentioned that DDD was initially build against resilient v2. Which I can't seem to be able to use anymore since fancytoc.sile is not available anymore.