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.

nodes.lua

@@ -1,57 +1,53 @@
 -- da wooden banner
-minetest.register_node("banners:wooden_banner",
-    {
-        drawtype = "mesh",
-        mesh = "banner_support.x",
-        tiles = {"banner_support.png"},
-        description = "Wooden banner",
-        groups = {choppy=2, dig_immediate=2},
-        is_ground_content = false,
-        diggable = true,
-        stack_max = 1,
-        paramtype="light",
-        paramtype2="facedir",
-        after_place_node = function (pos, player, itemstack, pointed_thing)
-            banners.banner_after_place(pos, player, itemstack, pointed_thing)
-          end,
-        on_destruct = function(pos)
-            banners.banner_on_destruct(pos)
-        end,
-        on_use = function(i, p, pt)
-            banners.banner_on_use(i, p, pt)
-        end,
-        on_dig = function(pos, n, p) 
-            banners.banner_on_dig(pos, n, p)
-        end
-    }
-)
+core.register_node("banners:wooden_banner", {
+    drawtype = "mesh",
+    mesh = "banner_support.x",
+    tiles = { "banner_support.png" },
+    description = "Wooden banner",
+    groups = { choppy = 2, dig_immediate = 2 },
+    is_ground_content = false,
+    diggable = true,
+    stack_max = 1,
+    paramtype = "light",
+    paramtype2 = "facedir",
+    after_place_node = function (pos, player, itemstack, pointed_thing)
+        banners.banner_after_place(pos, player, itemstack, pointed_thing)
+      end,
+    on_destruct = function(pos)
+        banners.banner_on_destruct(pos)
+    end,
+    on_use = function(i, p, pt)
+        banners.banner_on_use(i, p, pt)
+    end,
+    on_dig = function(pos, n, p)
+        banners.banner_on_dig(pos, n, p)
+    end
+})
 
 -- steel banner
-minetest.register_node("banners:steel_banner",
-    {
-        drawtype = "mesh",
-        mesh = "banner_support.x",
-        tiles = {"steel_support.png"},
-        description = "Steel banner",
-        groups = {cracky=2},
-        is_ground_content = false,
-        diggable = true,
-        stack_max = 1,
-        paramtype = "light",
-        paramtype2 = "facedir",
-        after_place_node = function (pos, player, itemstack, pointed_thing)
-            banners.banner_after_place(pos, player, itemstack, pointed_thing)
-          end,
-        on_destruct = function(pos)
-            banners.banner_on_destruct(pos)
-        end,
-        on_use = function(i, p, pt)
-            banners.banner_on_use(i, p, pt)
-        end,
-        on_dig = function(pos, n, p) 
-            banners.banner_on_dig(pos, n, p)
-        end
+core.register_node("banners:steel_banner", {
+    drawtype = "mesh",
+    mesh = "banner_support.x",
+    tiles = { "steel_support.png" },
+    description = "Steel banner",
+    groups = { cracky = 2 },
+    is_ground_content = false,
+    diggable = true,
+    stack_max = 1,
+    paramtype = "light",
+    paramtype2 = "facedir",
+    after_place_node = function (pos, player, itemstack, pointed_thing)
+        banners.banner_after_place(pos, player, itemstack, pointed_thing)
+      end,
+    on_destruct = function(pos)
+        banners.banner_on_destruct(pos)
+    end,
+    on_use = function(i, p, pt)
+        banners.banner_on_use(i, p, pt)
+    end,
+    on_dig = function(pos, n, p)
+        banners.banner_on_dig(pos, n, p)
+    end
 
-    }
-)
+})