Limit texture size (#6)

* whitespace and minetest. -> core.

- use same whitespace style throughout and fix some indents.
- change from minetest. to core. namespace.

* Update Readme: Minetest -> Luanti

* add luacheck

* update optional depends

* luacheck cleanups

- unused arguments
- shaddowed vars
- var redeclarations
- some whitespace involved in above lines

* clean close of file after reading

* avoid duplicate code

save some lines and some extra method calls.

* avoid error: "unknown global"

* stray whitespace fixups

* whitespace: switch all files to same indent character

tabs -> spaces

* refactor weird declaration

* whitespace: two stray spaces

...that slipped through the cracks on previous whitespace edit

* fix shaddowing global table

* reduce amount of times transformation string is calculated

* use ipairs feature

or use the faster repeat-until-loop

* cap max amount of layers

fixes #5

* fix #5 make transform history non-global

fixes #5
transformation history was shared by all users and kept growing as it
was never truely reset. Every time a user
used a banner a white background was dumped on top of the
stack making it possible to crash the server through an
overflow to core.serialize() function.

* minimize metadata size

also changed banners.max_transformations to
banners.max_undo_levels and lowered the value substantially.

* add versioning

* add recoverable per player history with saved colour

* rename update_all -> update_preview_inv

since it isn't updating everything, only
the preview and the inventory item

* dynamically update masks

to reflect the currently selected colour.

crafts.lua

@@ -1,78 +1,73 @@
 
 -- craft recipes
-minetest.register_craft( -- wooden flag pole
-    {
-        output = "banners:wooden_pole 1",
-        recipe = {
-            {"", "", "default:stick"},
-            {"", "default:stick", ""},
-            {"default:stick", "", ""}
-        }
-    }
-)
 
-minetest.register_craft( -- steel flag pole
-    {
-        output = "banners:steel_pole 1",
-        recipe = {
-            {"", "", "default:steel_ingot"},
-            {"default:stick", "default:steel_ingot", "default:stick"},
-            {"default:steel_ingot", "", ""}
-        }
+-- wooden flag pole
+core.register_craft({
+    output = "banners:wooden_pole 1",
+    recipe = {
+        { "", "", "default:stick" },
+        { "", "default:stick", "" },
+        { "default:stick", "", "" }
     }
-)
+})
 
-minetest.register_craft( -- wooden flag support base
-    {
-        output = "banners:wooden_base 1",
-        recipe = {
-            {"", "default:stick", ""},
-            {"default:stick", "", "default:stick"},
-            {"group:wood", "group:wood", "group:wood"}
-        }
+-- steel flag pole
+core.register_craft({
+    output = "banners:steel_pole 1",
+    recipe = {
+        { "", "", "default:steel_ingot" },
+        { "default:stick", "default:steel_ingot", "default:stick" },
+        { "default:steel_ingot", "", "" }
     }
-)
+})
 
-minetest.register_craft( -- steel support
-    {
-        output = "banners:steel_base",
-        recipe = {
-            {"", "default:steel_ingot", ""},
-            {"default:steel_ingot", "", "default:steel_ingot"},
-            {"", "default:steelblock", ""}
-        }
+-- wooden flag support base
+core.register_craft({
+    output = "banners:wooden_base 1",
+    recipe = {
+        { "", "default:stick", "" },
+        { "default:stick", "", "default:stick" },
+        { "group:wood", "group:wood", "group:wood" }
     }
-)
+})
 
-minetest.register_craft( -- banner sheet
-    {
-        output = "banners:banner_sheet 1",
-        recipe = {
-            {"", "", ""},
-            {"farming:cotton", "farming:cotton", "farming:cotton"},
-            {"farming:cotton", "farming:cotton", "farming:cotton"}
-        }
+-- steel support
+core.register_craft({
+    output = "banners:steel_base",
+    recipe = {
+        { "", "default:steel_ingot", "" },
+        { "default:steel_ingot", "", "default:steel_ingot" },
+        { "", "default:steelblock", "" }
     }
-)
+})
 
-minetest.register_craft( -- wooden support
-    {
-        output = "banners:wooden_banner 1",
-        recipe = {
-            {"", "banners:banner_sheet", ""},
-            {"", "banners:wooden_pole", ""},
-            {"", "banners:wooden_base", ""}
-        }
+-- banner sheet
+core.register_craft({
+    output = "banners:banner_sheet 1",
+    recipe = {
+        { "", "", "" },
+        { "farming:cotton", "farming:cotton", "farming:cotton" },
+        { "farming:cotton", "farming:cotton", "farming:cotton" }
     }
-)
+})
 
-minetest.register_craft( -- steel support
-    {
-        output = "banners:steel_banner 1",
-        recipe = {
-            {"", "banners:banner_sheet", ""},
-            {"", "banners:steel_pole", ""},
-            {"", "banners:steel_base", ""}
-        }
+-- wooden support
+core.register_craft({
+    output = "banners:wooden_banner 1",
+    recipe = {
+        { "", "banners:banner_sheet", "" },
+        { "", "banners:wooden_pole", "" },
+        { "", "banners:wooden_base", "" }
     }
-)
+})
+
+-- steel support
+core.register_craft({
+    output = "banners:steel_banner 1",
+    recipe = {
+        { "", "banners:banner_sheet", "" },
+        { "", "banners:steel_pole", "" },
+        { "", "banners:steel_base", "" }
+    }
+})
+