Add custom mods

- nalc modpack containing:
- nalc_lib: functions accessible by other mods
- nalc_hardtrees: Trees and other nodes becomes not hand breakable

custom/mods/nalc/nalc_hardtrees/depends.txt

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+nalc_lib
+default

custom/mods/nalc/nalc_hardtrees/init.lua

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+--[[ Auteur : sys4
+
+	Ce mod permet de :
+	- Ne plus casser les arbres à la main
+	- Supprimer haches et pioches en bois.
+	- Fabriquer les outils en pierre avec du silex trouvé dans le gravier
+
+	Remarque : Les sticks sont obtenables grâce au mod youngtrees de plantlife_modpack
+]]
+
+-- Suppression des haches et pioches en bois
+minetest.unregister_item("default:axe_wood")
+minetest.unregister_item("default:pick_wood")
+
+-- Suppression du groupe oddly_breakable_by_hand pour les nodes en bois du mod default
+local wood_nodes = {}
+wood_nodes["default"] = {
+	"tree", "pine_tree", "jungletree", "acacia_tree", "aspen_tree",
+	"bush_stem", "acacia_bush_stem",
+	"wood", "pine_wood", "junglewood", "acacia_wood", "aspen_wood",
+}
+
+for mod, nodes in pairs(wood_nodes) do
+	for _,name in ipairs(nodes) do
+		nalc.not_hand_breakable(mod..":"..name)
+	end
+end
+
+-- Recette de craft pour pioche et hache avec du silex
+minetest.register_craft({
+	output = "default:axe_stone",
+	recipe = {
+		{"default:flint", "default:flint", ""},
+		{"default:flint", "default:stick", ""},
+		{"", "default:stick", ""},
+	}
+})
+
+minetest.register_craft({
+	output = "default:pick_stone",
+	recipe = {
+		{"default:flint", "default:flint", "default:flint"},
+		{"", "default:stick", ""},
+		{"", "default:stick", ""},
+	}
+})

custom/mods/nalc/nalc_lib/init.lua

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+nalc = {}
+
+-- Remove node from a group
+local function remove_group(name, group)
+	local node = minetest.registered_nodes[name]
+	
+	if node then
+		local groups = node.groups
+		if groups then
+			for g in pairs(groups) do
+				if g == group then
+					groups[g] = 0
+					minetest.log("action", "[nalc_lib] "..name.." removed from group "..group..".")
+				end
+			end
+			minetest.override_item(name, {groups = groups})
+		else
+			minetest.log("warning", "[nalc_lib] "..name.." has no groups, could not remove group "..group..".")
+		end
+	else
+		minetest.log("warning", "[nalc_lib] "..name.." not registered, could not remove group "..group..".")
+	end
+end
+
+-- Remove node from group "oddly_breakable_by_hand"
+function nalc.not_hand_breakable(name)
+	remove_group(name, "oddly_breakable_by_hand")
+end