A-Void: a new minor preview release

Here it is, after a while, a new build. The gameplay changes are minimal: some visual feedback on what's happening on the screen. Other changes have been made under the table. Mainly I've evolved the on-screen messages handling, refactored the objects and enemy scripts, removed some global references to the game scene (you'll understand why I did that...), tried to enable asset preloading and wrote an input control handler to better handle keyboard and joypad input events.

In the meantime, I'm thinking about how to evolve this game to make it really interesting and I'm reading some books that might help me with game design...