The uC symbol was updated in the library: the (visible) difference is
that the thermal pad that was erroneously placed in the symbol while
physically missing from the package has been removed. Thus, the N/C
that was placed there is now hanging.

Switch TVS diodes for uC-connected I/Os and rst_n to 3.3V from the
(accidental) 24V used.

Change 12V fuse to the (correct) 4A component, now that we have the
part in the library.

Change the 18V zener for a better-sourced component.

The anchor point in such connectors is the geometric center, here the
first pin was used. This caused the component to be misplaced in
eurocircuits' pick-and-place check tool.

- replaced AD8029/8030 with OPA192/2192; the absolute maximum voltage
  was only 12.6V (12V + 5%). The OPAx192 has a maximum voltage of 36V.
- replaced the USB protection diodes with the right part, PESD5V2S2UT.

- replace IRFH5025PbF with IPD5N25S3-430 due to lower Vth shift
- add test points in various places
- add ceramic capacitors to MOSFETs and fans
- add some labels/groups to indicated which connector is for what
- reversed polarity of ESD protection on USB lines
- add 32kHz crystal in parallel with 8MHz
- add one more bypass cap to the uC
- replace main connector part
- show the power input/output voltage levels in the main sheet
- the low side of temp. monitor connections is fixed to ground, make
  that more obvious

- connect "rst_n" line to "EN" input of IC2 to fully power-cycle uC
  instead of just resetting
- remove 0.1% resistors
- optimize resistor values
- use just one type of 10UF capacitor
- optimize capacitor values
- use larger bypass caps for the MOSFETs
- use a schottky instead of the ultrafast ES2A
- add 10ohm current limiting resistors at the gate drivers
- add a fast zener at the gates