[Request] Enable "layers" for resource sheets

[Arch666Angel]

Simple request: Enable the ability to have layered sheets for resources

Code: Select all

     stage_counts = {1000, 600, 400, 200, 100, 50, 20, 1},
	stages ={
        layers={
	  sheet =
	  {
		filename = "__base__/graphics/entity/ores/ore-1-1.png",
		priority = "extra-high",
		tint = {r=0.40, g=0.20, b=0.05},
        width = 38,
        height = 38,
        frame_count = 4,
        variation_count = 8
	  },
	  sheet =
	  {
		filename = "__base__/graphics/entity/ores/ore-1-2.png",
		priority = "high",
		tint = {r=0.60, g=0.30, b=0.10},
        width = 38,
        height = 38,
        frame_count = 4,
        variation_count = 8
	  },
    }
	},