IronAge adapted

Construction plan added
power bugfix
formspec power_image added

basis/lib.lua

@@ -0,0 +1,14 @@
+function techage.range(val, min, max)
+	val = tonumber(val)
+	if val < min then return min end
+	if val > max then return max end
+	return val
+end
+
+function techage.one_of(val, selection)
+	for _,v in ipairs(selection) do
+		if val == v then return val end
+	end
+	return selection[1]
+end
+