use colorize for colorizing the paper

fixes Issue #3
needs 10 less textures :-) --> faster loading

init.lua

@@ -497,49 +497,49 @@ minetest.register_node("christmas_craft:silver_baubles", {
 
 	minetest.register_craftitem("christmas_craft:paper_blue", {
 		description = "Blue paper",
-		inventory_image = "christmas_craft_paper_bl.png",
+		inventory_image = "default_paper.png^[colorize:#0000FF99",
 		stack_max = 99,
 		liquids_pointable = false,
 	})
 
 	minetest.register_craftitem("christmas_craft:paper_yellow", {
 		description = "Yellow paper",
-		inventory_image = "christmas_craft_paper_ye.png",
+		inventory_image = "default_paper.png^[colorize:#ffff0099",
 		stack_max = 99,
 		liquids_pointable = false,
 	})
 
 	minetest.register_craftitem("christmas_craft:paper_green", {
 		description = "Green paper",
-		inventory_image = "christmas_craft_paper_gr.png",
+		inventory_image = "default_paper.png^[colorize:#00ff0099",
 		stack_max = 99,
 		liquids_pointable = false,
 	})
 
 	minetest.register_craftitem("christmas_craft:paper_red", {
 		description = "Red paper",
-		inventory_image = "christmas_craft_paper_re.png",
+		inventory_image = "default_paper.png^[colorize:#FF000099",
 		stack_max = 99,
 		liquids_pointable = false,
 	})
 
 	minetest.register_craftitem("christmas_craft:paper_violet", {
 		description = "Violet paper",
-		inventory_image = "christmas_craft_paper_vi.png",
+		inventory_image = "default_paper.png^[colorize:#9400d399",
 		stack_max = 99,
 		liquids_pointable = false,
 	})
 
 	minetest.register_craftitem("christmas_craft:paper_orange", {
 		description = "Orange paper",
-		inventory_image = "christmas_craft_paper_or.png",
+		inventory_image = "default_paper.png^[colorize:#ffa50099",
 		stack_max = 99,
 		liquids_pointable = false,
 	})
 
 	minetest.register_craftitem("christmas_craft:paper_pink", {
 		description = "Pink paper",
-		inventory_image = "christmas_craft_paper_pi.png",
+		inventory_image = "default_paper.png^[colorize:#ffc0cb99",
 		stack_max = 99,
 		liquids_pointable = false,
 	})