Need speech bubble on top of front layer sprite

[s_federici]

@jens

In current Scratch it's even worse, the speech balloon's layer does not change when the sprite's layer changes. Geez, that's clearly a bug in Scratch, don't you think?

This is certainly bad. But in Scratch a sprite cannot hide a speech bubble (do you have a counterexample?). In Snap instead sprites can hide speech bubbles (as shown in the two sample projects cited above that I have now correctly shared)