Add deprecation note.

Little fixes

Removing remaining direct serial Prints

Merge branch 'main' of lab.analogparadigm.com:lucidac/firmware/hybrid-controller

Usage stats (basic performance counters).

Merge branch 'debug-daq' into 'main'

fix(daq): fix at least the index overflow and improve code structure. Also adds waveform tests

Merge branch 'main' of lab.analogparadigm.com:lucidac/firmware/hybrid-controller

Test: Adding U-block connectivity testcase

tests: forgot to commit this

fix(tests): removed too much code :)

fix(carrier): Carrier::calibrate_routes should save and restore old ADC bus selection, not reset it

tests: make measure_sh_gain set and restore ADC bus selection

Fix of a direct Serial.print call.

fix(tests)