Audio engine Performances improvement 1:
   - Dramatically optimized convertBuffer() RtApi function, making it now neglectable in profiler, only fixed used formats from running on Win32 platforms with asio for now
   - Improved app_main main callback function calls at the frame level
   - minor improvement: inlined one polysynth function called several millions of times.
Provide a better trace in debug mode
Provide more powerful (yet still compatible with simple syntax) API for controls:

Now tooltips can be initialized in a 1-liner and  on the fly like:
    pGraphics->AttachControl(Btn->SetTooltip("The best code is often the shortest"));
Updating read me to summarize the work in progress and the objectives