add io brick, misc fixes

bricks/inputs/iobrick-input.lua

@@ -0,0 +1,12 @@
+
+return function(gate, argv)
+	local arg = argv[1]
+	for i = 1, #arg, 2 do
+		local d = arg:sub(i, i+1)
+		local v = tonumber(d, 16) or 0
+		if #gate.queueIn < 2048 then
+			table.insert(gate.queueIn, 1, v)
+		end
+	end
+	Gate.queue(gate, 0)
+end