param_t is only used as an offset and we have <1000 params, so an uint16_t
is enough.
This saves roughly 1KB of RAM. We only do that on NuttX because normal
integers have better performance in general.
Previously on amd64, this was even 64bits because it was an uintptr_t.

This further speeds up param loading.

On Pixracer via USB, it's possible to send up to 11 at once before the TX
buffer gets full, so there is still enough free bandwidth left.

This speeds up parameter loading. Slow links like telemetry are unaffected,
since the mavlink loop runs only with ~100Hz.

Tested on various links, like:
- telemetry link
- pixracer WiFi
- pixracer USB
- SITL

The white led state would continue during calibration, now it return to the previus state

with priority and blink period

Previously the retry would not actually have been sent if nothing had been received in time.

* Remove remove safty swtich LED from FMU control

* Differentiate GPIO_BTN_SAFETY_FMU  from GPIO_BTN_SAFETY

Logger: Drop position_setpoint_triplet to 5 Hz since its not required at such a high rate in analysis

- starts with yellow blinking
- turns led to solid according to progress
- blink red on error, green on success

This can be used to test & control the new uorb-based led backend.

This is the new interface to control external LED's (user-facing).
Features:
- Supports maximum N Leds (where the board can define N)
- on/off/blink M times
- Different priorities
- Allows setting a single led or multiple at once

This makes it clear that it's used to control the board LED's, not external
LED's.

In addition this is almost a copy of the rgbled driver

The check if stick were touched was only working in one direction (per
axis) because fabsf was used incorrectly.

However, this check is still only a differential check triggered by
fast movement and does not trigger if someone slowly moves a stick to
the side. Also, the sensitivity depends on the rate of the commander
loop and/or the RC update loop. The correct solution would be a proper
filtering and trigger for movement.