porting to m33 serial API

getPorts -> getDevices
open -> connect
wrong delete
nit
finish
make onReceive work.

Next TODO is make buffer size 0 or 1;
and close port.
Make send work.

.
serial close for M33
version to 1.3
Merge pull request #23 from beagleterm/m33_serial

Make BeagleTerm work against Chrome M33 serial update