Read level schematic size

mods/lzr_levels/init.lua

@@ -16,10 +16,11 @@ local level_data = {}
 local analyze_levels = function()
 	-- Mark levels that contain at least 1 rotatable block
 	for l=1, LAST_LEVEL do
-		level_data[l] = {
-			contains_rotatable_block = false
-		}
 		local schem = minetest.read_schematic(minetest.get_modpath("lzr_levels").."/schematics/lzr_levels_level_"..l..".mts", {write_yslice_prob="none"})
+		level_data[l] = {
+			contains_rotatable_block = false,
+			size = schem.size,
+		}
 		for d=1, #schem.data do
 			local nodename = schem.data[d].name
 			local is_rotatable = minetest.get_item_group(nodename, "rotatable") == 1