Project is 64-bit ARM friendly

Still doesn't compile in ARM64 due to missing libraries in ARM64 mode, but at least cocos2d compiles file.

Also this patch enables a very important flag in Xcode:

* 64-to-32-bit conversion warning.

There are more than 200 warnings because of this issue. And if we don't fix those warnings we could have serious bugs.
( I already fixed some of them )