Fixed #507: Improved support for static variables.

[codecov[bot]]

Codecov Report

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

Project coverage is 97.99%. Comparing base (64ab34b) to head (e5e3835).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #619 +/- ## ========================================== - Coverage 98.03% 97.99% -0.04% ========================================== Files 20 20 Lines 4887 4891 +4 ========================================== + Hits 4791 4793 +2 - Misses 96 98 +2 ``` | [Flag](https://app.codecov.io/gh/andreasfertig/cppinsights/pull/619/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Fertig) | Coverage Δ | | |---|---|---| | [ubuntu](https://app.codecov.io/gh/andreasfertig/cppinsights/pull/619/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Fertig) | `97.93% <100.00%> (-0.04%)` | :arrow_down: | | [ubuntu-libcxx](https://app.codecov.io/gh/andreasfertig/cppinsights/pull/619/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Fertig) | `97.99% <100.00%> (-0.04%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Fertig#carryforward-flags-in-the-pull-request-comment) to find out more.

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