Interact Menu - Combine parent menu with single child

[Dystopian]

When merged this pull request will:

• add setting to combine parent menu with single child;
• adapt fastroping Cut ropes action for the setting;
• clean up chemlights and map menu configs a little.

Setting is disabled by default. Still not sure about setting name and description.

[veteran29]

works. Nice feature 👍

[PabstMirror]

Really minor, but I want to test how this will work with #6876
where I used the child as a "safety"
I think we can just add a dummy statement if it's a problem

[PabstMirror]

We need this if child action has different object
e.g. a single passenger won't show any interactions because the object was still on the vehicle

[Dystopian]

@PabstMirror please review the last commit