add NBuffer
Change NMemTool's name
add Test for NModule
update zip library
update vsprops
add NZip/NFileMapping

remove ReflectReg in NReflect.h, to make ReflectClass to be a local class
change size_t of NString to int, to solve warning about type mismatch between them
add some functions to FileUtil
add files used as TestCases
add test for NBuffer、NFileMapping、NZip