Refactored the interface of the io package

examples/point/point.q

@@ -1,5 +1,5 @@
+import io
 import mem
-import sys
 
 Point {
 	x int
@@ -29,6 +29,6 @@ print(p *Point) {
 	out[5] = ' '
 	out[6] = '0' + p.y
 	out[7] = '\n'
-	sys.write(1, out, 8)
+	io.write(out)
 	mem.free(out)
 }