Sfinv: Add and use a crafting arrow texture instead of using furnace arrow

mods/sfinv/README.txt

@@ -11,3 +11,8 @@ https://forum.minetest.net/viewtopic.php?t=19765
 Authors of source code
 ----------------------
 rubenwardy (MIT)
+
+Authors of media
+----------------
+paramat (CC BY-SA 3.0):
+  sfinv_crafting_arrow.png - derived from a texture by BlockMen (CC BY-SA 3.0)

mods/sfinv/init.lua

@@ -6,7 +6,7 @@ sfinv.register_page("sfinv:crafting", {
 		return sfinv.make_formspec(player, context, [[
 				list[current_player;craft;1.75,0.5;3,3;]
 				list[current_player;craftpreview;5.75,1.5;1,1;]
-				image[4.75,1.5;1,1;gui_furnace_arrow_bg.png^[transformR270]
+				image[4.75,1.5;1,1;sfinv_crafting_arrow.png]
 				listring[current_player;main]
 				listring[current_player;craft]
 			]], true)

mods/sfinv/license.txt

@@ -22,3 +22,38 @@ DEALINGS IN THE SOFTWARE.
 
 For more details:
 https://opensource.org/licenses/MIT
+
+
+License of media
+----------------
+
+Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
+Copyright (C) 2019 paramat
+
+You are free to:
+Share — copy and redistribute the material in any medium or format.
+Adapt — remix, transform, and build upon the material for any purpose, even commercially.
+The licensor cannot revoke these freedoms as long as you follow the license terms.
+
+Under the following terms:
+
+Attribution — You must give appropriate credit, provide a link to the license, and
+indicate if changes were made. You may do so in any reasonable manner, but not in any way
+that suggests the licensor endorses you or your use.
+
+ShareAlike — If you remix, transform, or build upon the material, you must distribute
+your contributions under the same license as the original.
+
+No additional restrictions — You may not apply legal terms or technological measures that
+legally restrict others from doing anything the license permits.
+
+Notices:
+
+You do not have to comply with the license for elements of the material in the public
+domain or where your use is permitted by an applicable exception or limitation.
+No warranties are given. The license may not give you all of the permissions necessary
+for your intended use. For example, other rights such as publicity, privacy, or moral
+rights may limit how you use the material.
+
+For more details:
+http://creativecommons.org/licenses/by-sa/3.0/