Fixed POSIX build

Atomics was refactored

Fixed CompareAndSwap in POSIX AtomicPtr

AtomicPtr was added.

CompareAndSwap added to atomics

Fix fire and forget tests

More asserts

Profiler event listener

Increase maximum fibers count

Compilation fix ( OSX/Unix )

Compilation fix (OSX/Unix)

Fire and forget tasks using TaskPool

Fire and forget tasks WiP. TaskPool first iteration.

Remove all std::vector usage

Fixed compilation warning on MSVC

Custom memory allocator - fix POSIX build

Custom allocator - first iteration WiP

Rename DECLARE_DEBUG to MT_DECLARE_DEBUG_INFO

Tasks now are non-copyable

OSX support

Posix stack guard page now located in right place (stack grows downwards)

Rewrote Windows fibers using GetThreadContext / SetThreadContext

Rewrote stack allocation for POSIX fibers.
Now in case of stack overflow we get SIGSEGV signal instead of memory corruption.

Check theory about stack corruption

Rewrite TaskGroup from typedef to class, additional validation included