* Allow setting a seed in websocket prng to workaround a valgrind bug
in Xenial.
* Coverage collection in Azp.
* Fixup blacklists to avoid zlib bugs.
* Use native b2 features for sanitizers and valgrind.
* Expanded Windows build matrix.
* Add additional clang (with libc++) builds.
Signed-off-by: Damian Jarek <damian.jarek93@gmail.com>
- Don't set the global link settings (`<link>`) to avoid dependency
ordering issues in the future.
- Allow the user to decide on the link settings for dependencies
(filesystem/coroutine).
- Make dependencies in examples explicit.
- Remove dependency of examples on Boost.Filesystem (was not used there).
- Deduplicate build settings.
- Speed up test compilation by avoiding rebuilding of main test file.
Signed-off-by: Damian Jarek <damian.jarek93@gmail.com>
