Add some semi-automatic testing

[zingo]

Invesigate different way to test the code and maybe create sub issues to implement them.

Some random ideas:

• - Maybe a test build generating signals as testdata, or a way to send signals via serial console so we can drive testing from it.
• Unit testting from platformIO
• Does an Arduino or PlatfomrIO testing framework exist? Investigate a bit...
• CI testing, like build-test, lint test, code formating test, on github?
• Simulate iTags on a 2nd ESP32, making iTags with different BTUUID appear and dissappere like in a race.
• Test maximum participants with maximum laps and save and check memory and disk left.
• Profiling? Show perf graphs a la linux boot/chrome

[zingo]

EndToEnd Tests in code is a added with 8d911b3