Native textFields and textBoxes simulation on windows

Adds a raw and buggy support for native.newTextField and native.newTextBox functions on windows. Very useful to test textfields without build for a specific device.

To use it just include this file in your project folder:
https://raw.github.com/ProGM/CoronaSDK-win-native/master/win_fix.lua

and add this code to your main.lua:

 if "Win" == system.getInfo( "platformName" ) then
    require("win_fix")
end