Touch controls added

So I have now used ControlFreak2 to add touch controls to the game for mobile devices in WebGL!  There is now a D-pad in the bottom left and 4 food buttons along the bottom.  I have also made the UI buttons on all screens bigger to make touch easier, and have moved UI elements around a little to better accommodate touch controls.  Of course the game can still be played with keyboard/mouse or gamepad/mouse - the touch controls will not be visible when you are playing in this way.

I'd really appreciate it if you let me know what you think!