Pycardium Improvements

Closes #76 and #212

See merge request card10/firmware!417

This will result in more reliably reaching a clean state.

Co-Authored-By: schneider <schneider@muc.ccc.de>
Signed-off-by: Rahix <rahix@rahix.de>

See merge request !418

Also auto generate the header during build time.

Instead of "rebooting" Pycardium, hand over control to core 0, notifying
it of a severe failure via epic_exit(253).

Signed-off-by: Rahix <rahix@rahix.de>

Calls to abort() shouldn't make core 1 busy-spin; call epic_exit()
instead.  Fixes #76.

Signed-off-by: Rahix <rahix@rahix.de>

Instead of dropping to REPL and silently requiring the user to return to
menu via button-press, directly call epic_exit(0) when a script
terminates execution normally (i.e. not via exception).

Signed-off-by: Rahix <rahix@rahix.de>

Remove the big endless loop from pycardium main and instead use
epic_exec("") to switch to REPL.  This way, any MicroPython state is
reset and also all hardware will be in a clean reinitialized state.

This also means that pycard10.py will now run scripts in a clean
environment that is not tainted by whatever was running before.

Fixes #212.

Signed-off-by: Rahix <rahix@rahix.de>

Always print the pycardium header and a short message afterwards what
pycardium is about to do.

Signed-off-by: Rahix <rahix@rahix.de>

See merge request !416

See merge request !407

Closes #36

See merge request !415

Closes #36

Closes #211

See merge request !411

Closes #211

Closes #209

See merge request !410

Closes #208

See merge request !408

Closes #210

See merge request !409

change(exnostat): Don't try to differentiate between Google and Apple

See merge request !412

Closes #210

Add G-Watch to preload

See merge request !396

Closes #208

The button to turn on the LEDs gets pressed easily, making them waste
battery.

This reduces the power consumption when the display is off by
about 3.8 mA.

card10 with BLE off and without this patch: 11.5 mA
card10 with BLE off and with this patch: 7.7 mA

Read date/time from iOS device

See merge request !406

Accessory Design Guidelines for Apple Devices says that TX power should
be included in the advertisement.

Also ask for the current time service in the scan report so the card10
shows up in the system dialog.