feat - safe clean buffers

[RodrigoDornelles]

A garbage collector is currently being developed to clean buffers. It would be beneficial to ensure that the buffer has been cleared to avoid unsafe and undefined behaviors.

• http://www.daemonology.net/blog/2014-09-04-how-to-zero-a-buffer.html
• http://www.daemonology.net/blog/2014-09-05-erratum.html
• https://stackoverflow.com/questions/6664471/observable-behaviour-and-compiler-freedom-to-eliminate-transform-pieces-c-co