Adding initial version of Sony OA-S3400 converter.

Adding initial version of Sony OA-S3400 converter.

- Not fully reading for usage, but 90% of the way there for typing.
- Some soldering is required for 2 keys to work properly (Shift and Shift Lock)
- Even when complete, be careful when doing multiple key combos, as the key buffer is only cleared when all general keys are released (all except Shift, Shift Lock, and Code)