Update 1.4

This is quite a big update. First of all, a new mode called chromablitz, where lines of different colors do different things. Just an extension of survival mode, with some new features. Next, there is now previewing before placing gems, what they are going to do. This is a pretty cool feature,  and it makes the game feel more alive, I think. The way animations display has been improved, and we end on the bug fix where sometimes you could place air.