Set version to 3.2.2-beta
Set version to 3.2.2-beta

The 3.2.2 release will include quite a few new features which warrant
at least one beta build before RC:

- GLES2 2D batching
- Mono/C# support for iOS
- New Android plugin system

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot