Inkbit Minor patch

Greetings!

Just updated to demo to fix a few things, that were requested : 

- Inkie (player) can now be controlled with either WASD or the arrow keys

- Added Z,X,C,V keys as element selection, just as buttons 1,2,3,4

- Game menus can now be navigated with arrow keys, and enter key is also supported

- Also fixed a few minor problems, like bomb collision when it's moving automatically (affected by magnet aka. "multignet")

With the new button support added the game can be played either single- or double-handed.

Hope this helps!