Add DMX-IO1, DMX-512 support
- Added termination switch
- Change to RFM-0505S
- Change to MAX485E
- Swap A and B on Max485
- Avoid split power planes under WH4
- Remove pads from XLR alignment pins
- Fix pinout of U1
- Added io-dmx module Receiver software
- Added io-dmx module Transmitter software
- Breakup TX2 into 2 boards, allowing IO boards to be used with TX1.
- Update PCB links in readme, bom, parts
- Add IO1 parts to BOM generation.
- Update U1 part links in readme