* Add sancov multimap observer to sancov_8bit target
* Undo autofmt of Cargo.toml
* Fix formatting
* Fix import errors under no-default-features, add Safety to counters_maps_observer
* Make observer function no_mangle to allow it to easily be used in a staticlib crate
* Make clippy happy by using export_name instead of no_mangle
* Add observers feature flag and hide counters maps observer behind it
* Fix formatting
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