Improved layer system

MindShake has improved its layer system.

Until now the layers were little else that an object container, but now you can: 

• Set the layer position, affecting all the objects inside.
• Modify layer render order.
• Scale independently each layer, horizontaly or vertically.
• Set its pivot, to move each layer snugly and make nice transitions.
• Modify the layer alpha channel or colorize (tint) it, to make some cool effects.

And, of course, you can still enable camera transformation to leave the system to adjust the layers relative position and scale to do automatic parallax scrolling.

All these changes affect the contents of the layer and you can make some effects more easilly now.