RoboticsBrno / RB3204-RBCX - History

MainBoard: 4 layers, motors connector, DRV8833, libraries

- set 4 layers stack + change DRC setting about same signals, the rest is still same (possible place
for improvements due to 4 layers stack and https://jlcpcb.com/capabilities/Capabilities)
- motors connectors - remove terminal blocks, replace pinheads with JST-PH6 (2mm x 6 pins)
- DRV8833
- improve `DRV8833.lbr` library - fix thermal GND pad under the package
- reroute on DPS and add thermal VIAs according http://www.ti.com/lit/an/slma004b/slma004b.pdf
- reroute `Q1` and `Q2` + main power terminal block
- libraries - add `jst-ph.lbr` and document `LIBRARIES.md` with source info about used libraries
- please extend the `LIBRARIES.md` in the feature

MainBoardBRD: route power supply parts

Routed:
- on/off power transistor Q1. Q2
- power supply step-ups
- servos power supply
- apply `robotikabrno.dru`

Merge pull request #5 from RoboticsBrno/fw-cdc

Add CDC loopback