[Feature request] Adding support of folding/unfolding

[ohault]

For files organized in sections like INI file formats, WimMerge could implement a smart folding/unfolding or corresponding Sections.

In notepad++ :https://npp-user-manual.org/docs/udl/folding-in-code/

This will also bring a more advanced native support of INI file formats used in INI, INF, REG, SIF, ... https://github.com/WinMerge/winmerge/discussions/1975