Replaced all references to nme by references to openfl.

Hi.

I tried to use your project with new versions of Openfl and I needed to make some changes in order to it to work.

Now I'm sending it to you in hope you integrate it in the original project.

I did the following:

- replaced all occurrences of nme by the openfl;

- replaced all occurrences of Hash and IntHash by Map;

- replace BitmapInt32 by Int;

- removed the application.nmml file and added project.xml as it's the standard file name on Openfl.

Regards.