Removed unused constructor in MutexLock along with set_and_take() method, had to change FORCE_PLUGIN_MUTEX() for that. Removed release() method.
default bool and ! operator from both MutexLock and MutexTryLock with is_locked() API. Changes if (lock) to if (lock.is_locked()) across the code base.
Ran make test will be performing more system testing. Posted before for early comments / feedback.