First pass at converting LUA.

The VS2012 solution file comes with two projects:

1. library - which is a static library project that compiles all of the
Lua .cpp (renamed from .c to use the modern compiler) and .h files into a
single lua.lib file.

2. TestLuaRT - as the project name suggests, this simply loads the static
lib, the correct headers and tries to use lua. This started from the
original Windows 8 DirectX/C++ VS template.

This commit only tests the following lines of code (in Direct3DApp1.cpp):

lua_State *L = luaL_newstate();
lua_close();

...and it doesn't crash :). More to come soon!