v0.15.0

@tglane

Notable features in this release:

Support LIBCORO_FEATURE_NETWORKING on kqueue based operating systems, e.g. coro::io_scheduler is now supported on MacOS. Thank you @tglane
coro::thread_pool now must be created as a std::shared_ptr via coro::thread_pool::make_shared()
Added coro:queue<T>
Added coro::condition_variable Thank you @dobord
Added default executors, similar to libuv's default_loop().

sync_wait() remove extra move constructor call by @jbaldwin in #302
std::shared_ptr passed by value instead of by reference by @Sola1Go in #303
task_self_deleting bugfix in copy assignment operator by @jbaldwin in #305
Add support for coro::task for coro::when_any by @jbaldwin in #310
Adds coro::queue by @jbaldwin in #311
Update mac os ci workflow to use newer version of llvm and mac os by @tglane in #318
Add cmake options for sanitizers: address, memory, thread, undefined by @dobord in #323
Add coro::default_executor by @dobord in #321
Fix when any flakey tests by @jbaldwin in #326
test ring_buffer hang by @jbaldwin in #327
Upgrade catch2 to latest by @jbaldwin in #331
sync_wait does not rethrow user exceptions by @jbaldwin in #333
Add coro::condition_variable by @jbaldwin in #319
Semaphore test failure by @jbaldwin in #334
coro::ring_buffer use coro::mutex instead of std::mutex by @jbaldwin in #336
coro::thread_pool force usage as std::shared_ptr by @jbaldwin in #338
Fix for Xcode hang by @VitaliLiashchuk in #341
coro::queue::try_pop() by @jbaldwin in #342
Re-fix issue-270 by @jbaldwin in #343
feat: add kqueue support by @tglane in #317
MacOS supports LIBCORO_FEATURE_NETWORKING docs update by @jbaldwin in #346
free(): invalid pointer in when_any tests by @jbaldwin in #349

Full Changelog: v0.14.1...v0.15.0