Add armor set and armor set bonus setting (#41)

- Add settingtypes of:
  -  armor_set_elements
  - armor_set_multiplier
- Add check to armor.registration_armor for "_materialname", print msg to debug if not found
- Complete change to how an armor set is calculated
- Set elements linked to settingtypes no longer hard linked to num armor.elements
- Set multiplier linked to settingtypes no longer hard coded
- Readme.MD updated:
  - Addition of the 2 new settingtypes
  - Addition of "Armor Material" topic

3d_armor/init.lua

@@ -48,6 +48,8 @@ for name, config in pairs(armor.config) do
 	local setting = minetest.settings:get("armor_"..name)
 	if type(config) == "number" then
 		setting = tonumber(setting)
+	elseif type(config) == "string" then
+		setting = tostring(setting)
 	elseif type(config) == "boolean" then
 		setting = minetest.settings:get_bool("armor_"..name)
 	end
@@ -62,6 +64,10 @@ for material, _ in pairs(armor.materials) do
 	end
 end
 
+-- Convert set_elements to a Lua table splitting on blank spaces
+local t_set_elements = armor.config.set_elements
+armor.config.set_elements = string.split(t_set_elements, " ")
+
 -- Remove torch damage if fire_protect_torch == false
 if armor.config.fire_protect_torch == false and armor.config.fire_protect == true then
 	for k,v in pairs(armor.fire_nodes) do