Script for building Windows dist with python bundle and required modules

Uses cx_Freeze to do all the stuff.
Produces directory with "frozen" aceproxy and .exe to lauch it. Also makes an installer for aceproxy.
It will be much less painfull for Windows users to install and use proxy when we will give them just an installer and that's all they'll need to do.
Every release just run the script and upload the installer please.
Steps to build are described in the script file.