and 3d-components!

this revision fixes these errors:

- missing trace connecting powerboost:bat-low to the pi-zero
- wrong transistor pinout Q3 - turned out to be not needed and removed anyway

- clearance for protuding hdmi-connector tabs

- mounting holes undersized
- rerouted usb-traces (equal length, less vias and traces crossing)

- corrected usb-solder pad position

- wrong pinout on BJT transistor for backlight

diff of the copper layers: