Ensure that continuables that are resolved immediately are always sym…

…metrically transferable

fix clang coroutines detection

Fix Stopping a continuable in a failure handler makes wait() hang for…

…ever

* Closes #46
* Closes #48

Fix a race condition in cti::transforms::wait()

* Thanks to p4654545 for reporting this issue and providing a reproducible example
* Closes #38

Add a quick tour to the readme

Fix a MSVC C++latest warning regarding allocator traits

Address a MSVC compiler bug which prevents collapsing references in c…

…oroutines

* Closes #2

Push the version to 2.0.0

Beautify the doxygen main page

Rework the alias trait