* First draft of a Asan tests. As of now, unix-only. This is a WIP, as 1) destroying Gum causes segmentation fault and thus a single test is supported by using a static Gum object. Ideally, this should be fixed and a new Gum instance would be created for each test. 2) 70 identical errors are reported by Asan instead of a a single one. Apart from that, the draft fixes a number of errors found in Asan
* Fmt fixes
* PR comments addressed
* Not crashing upon Asan errors while testing
* More PR comments: removing env_logger, renaming harness to test_harness
* Revert "More PR comments: removing env_logger, renaming harness to test_harness"
This reverts commit 2d3494b3f56e0a5ef23566cb9a884e8c57867b57.
* More PR comments: removing env_logger, renaming harness to test_harness
* Checking for clang presence and failing the test if harness not found
* Fmt
* Running multiple Asan tests
* Cpp Fmt
* clang-format
* More clippy complaints and Apple compilation
* Last clippy complaints (ran scripts/clippy.sh)
* Fixing unused MacOS function
* Fixing unused MacOS imports
6a72f8a1ad