* Add a few pre-made sanitizer suppressions
* Test Sanitization: Fix threading issues
* Test Sanitization: Allow deletion of PubSub
We still don't delete it in main code, but this allows us to try
deleting it in tests.
* Test Sanitization: Fix some memory leaks
* fix gtest clang-tidy warning
* const emojis test :-)
* Specifically, this adds a caller to the network request, which makes the
success or failure callback not fire.
This has the unintended consequence of the block list not reloading if
the usercard is closed, but it's not a big concern.
* Add unrelated `-DUSE_ALTERNATE_LINKER` cmake option
From 0517d99b46/CMakeLists.txt (L87-L103)
