Clear tiles under objects / creatures / etc about rawig

[VedVid]

I'd like to make it in such a simple way:

func PrintObjects(b Board, o Objects, c Creatures) {
	for _, v := range o {
		if (IsInFOV(b, c[0].X, c[0].Y, v.X, v.Y) == true) ||
			(v.AlwaysVisible == true) {
			for l := BaseLayer; l < v.Layer; l++ {
				blt.Layer(l)
				blt.ClearArea(v.X, v.Y, 1, 1)
			}
			blt.Layer(v.Layer)
			glyph := "[color=" + v.Color + "]" + v.Char
			blt.Print(v.X, v.Y, glyph)
		}
	}
}

so, just clear tiles under specific entity. But the problem is that player is always first element of slice, so creatures with layers smaller than player are printed after him.

[VedVid]

Fixed by 667b9d0 It's not elegant solution, thought :(

[VedVid]

It's still an issue, because Creatures' corpses will be rendered under, for example, objects.

[VedVid]

I'm leaving rendering system as it was before changes until I'll figure out how to fix it properly.

[VedVid]

I think that it will be "hacked" in proper games.

It would be nice to have proper, universal solution in RAWIG as well.

[VedVid]

Fixed by 75b954b