Added tests for capture, section, and skip

[cschreib]

This PR does the following.

Other miscellaneous changes:

• snatch.hpp now includes snatch_config.hpp to reduce the risk of mismatched configuration with implementation.
• (docs) Added example CMake usage instructions for #23.
• (docs) Clarified what happens when a test with sections is aborted.
• (tests) Added tests for SECTION(), CAPTURE(), INFO(), and SKIP().
• (CI) Let all tests run even if some failed.

[codecov-commenter]

Codecov Report

Merging #22 (1aeca5e) into main (085038c) will increase coverage by 5.87%. The diff coverage is 100.00%.

Additional details and impacted files

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