Fix capture/section state after unhandled exception(s)

[cschreib]

This PR does the following:

• Fix #177 by checking for unhandled exception before popping capture data that goes out of scope. This also affected SECTION.
• Add explicit casts in internal code to avoid potential ambiguous calls to append() when user defines their own overloads.
• Fix the codecov configuration.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.03%. Comparing base (d663212) to head (7994241). Report is 8 commits behind head on main.

Additional details and impacted files

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[cschreib]

Thanks for the review @tocic, sorry I had unpushed changes. The issue reported in #177 also affected SECTION(...), the last commit addresses this. This PR should be complete now ;)