minor performance boost

add mi_process_info

stable release 1.6: move to standard C atomics

stable release 1.6: fix minor issues

avoid link error on non-windows

fix minor issues

fix minor issues

fix build and alignment issues (microsoft#200,microsoft#202,microsoft…

…#203,microsoft#204,microsoft#206)

fix potential leak, heap block overflow detection, page reset enabled

improve free performance, minor bug fixes