Create posix wrapper for condition variable

## Brief feature description

A posix wrapper for condition variable which allows a safe and easy usage.
* The mutex should be included
* The underlying variable should be part of the condition variable (for the actual condition)
* The predicate should be defined in the constructor
* It should be shared memory compatible

## Detailed information

Such an implementation would allow a safe usage of condition variables throughout the code and could be a replacement of the semaphore based shared memory condition variable implementation.