Added gnd shield under PHY oscillator

Expanded polygon cutouts around breakout through-holes, cleaned up some silk-screen positioning.

Final ethernet touchups

Rerouted ethernet interface

Updated rmii keepout regions again...

Updated rmii interface polygon regions.

Fixed VDDA, VREF+

Mainboard fully routed

Altered MCU Power Sch, file cleanup into _archive

Manual merge - 503f7a8 'Cleaned up respository files'