[wip] exception handling spec (and other specs): fix numbering, fix broken references, add links for all references

[wip] exception handling spec: mainly split comment subsection of section B into smaller comment sections for each subsection of B

Throws logic_error if these modifiers are used in the top level

[wip] exception handling spec: clarify behavior if DataValidity::faulty already set before an exception

[wip] exception handling specification: add section with requirements for the TransferElement and other minor changes

Currently does not get the modules in a way that they can be downcasted
to test if StatusMonitor, etc

Correctly navigate to parent module via virtual path.