Prototype v3.0 boards in the works at oshpark.com

Main change is the addition of a footprint for a Microchip SOT-23-5 I2C EEPROM

This will theoretically provide EEPROM storage to retain state on microcontrollers without internal EEPROM.

Other footprints unchanged so I can use the old stencil when this is not populated.

Other tweaks:

• Fiducials for cnc pick and place
• Filled in circles on the address silk screen
• Rounded corners to make it less poky on the packaging

This is not checked in yet.