The user can now move layers and choose which one to put on top of each other just by dragging and dropping them in the layer menu. Also fixed a bug in the eyedropper, that can now pick a colour even though the layer it's on is not selected.
At the moment the new canvas is correclty added and it's possible to draw on it after selecting the corresponding layer. There's a bug that doesn't let the user select a layer after the first time.
At the moment there's a bug in the getCursorPos function, may have something to do with offsets. The rect is correctly drawn, but with a weird offset.
Added vfx canvas for tools previews.