Refreshing Table of Contents after document generation

**Is your feature request related to a problem? Please describe.**
You can create a document with multiple headings and then use a docx feature called "Table of Contents" which will display table of contents based on those headings.

In LIbreOffice it's located here: Insert -> Table of Contents and Index -> Table of Contents, Index or Bibliography...
If you change the headings, you can regenerate table of contents in with Tools -> Update -> Update all

Some headings & sections in stencil can be hidden with if clause, which means table of contents becomes outdated.

**Describe the solution you'd like**
It would be nice to make stencil refresh table of contents after document gets compiled.

**Describe alternatives you've considered**
It's possible to resolve this issue manually by introducing additional step in the rendering process, by running virtualized libreoffice and asking it to refresh the contents.