SoftwareSerial, writer support

Now can create a SoftwareSerial interface on two digital pins and write to that interface through Dino. Building in read support will come as I come to understand how Dino gets results from the board. Until then, this should be sufficient for one-way communication needs (such as a thermal printer). 

(Once I get a new power supply for said thermal printer, I hope to write a Dino component for it.)