ble: Increase max size of the firmware string

See merge request !505

pycardium: Enable f-strings

See merge request !506

For some development builds, the firmware version string can get quite
long.  For example: `v1.17-123-g2120027c87da-dirty`.  To ensure such
long versions still get transmitted properly, increase the buffer size
to 32 bytes.  Let's hope that's enough for now...

Nobody noticed by MicroPython 1.17 brings f-strings.  Let's enable them!

See merge request !504

They were created to support very early launcher scripts and are not
needed anymore. This also makes some apps from the hatchery work, as
they were not developed with app launchers in mind.

See merge request !502

We want to rethink how to implement this.

This reverts commit a4c05d3f.

See merge request !501

Due to the new renderer, there is now enough space for longer messages.
Write out the full messages instead of "compressed" ones.

feat(micropython): Print exceptions to the screen

See merge request !450

epicardium: Query BLE hardware for idle periods

See merge request !500

Query the BLE base band for idle periods and put the CPU to sleep during
this time. This allows us to reduce clock speed again and wake up in
time to quickly serve BLE interrupts.

In the future we can now even go lower than DIV4, as BLE continues to
work at least until DIV16.

clock: Raise clock speed for BLE to work while sleeping

See merge request !499

feat(ecg): Experimental streaming of ECG samples via BLE

See merge request !493

mp: Correctly mask interrupts

See merge request !498

mp: fix 32 bit overflow in systick_get_us

See merge request !497

ble: Add firmware revision to device info service

See merge request !496

Indicate on screen that a reset will happen

See merge request !495

Add a boot animation to show off CTX

See merge request !494

When ctx is currently running in the dispatcher task to perform some
drawing calculations, the code here in the pmic task might preempt it.
This can lead to odd glitches and probably in the worst case a crash.
Because we know that no other code will continue running after we've hit
the shutdown codepath, we can just force-reinitialize ctx here.

Print "Reset!" to the screen before resetting so it is obvious what is
about to happen.  Currently, the screen brightness just suddenly jumps
up and card10 becomes unresponsive until the bootloader shows up.

feat(ble): Add a queue for indications and notifications

See merge request !491

Closes #237

See merge request !490