Don't leave RX in bind mode if console open fails

ubx driver cleanup and improvments

Don't leave RX in bind mode in the unlikely eventuality that console
open fails

ubx: SVINFO parsing optimized and message rate increased, CPU consumption reduced in 6 times, ~0.3% now.

Major ubx driver cleanup: few pages of code removed, send update only when full navigation solution received

Arm/disarm and SAS modes order safety fixes

- Use distinct common symbols for px4io and px4fmu device files, and use
instead of hardcoded filenames
- Use common symbols defining px4io bits consistently between px4fmu and
px4io builds.

fixed attitude estimator params

gpio_led: PX4IO RELAY and ACC outputs support

Ammended UBlox driver to record SV Info, satelites_visible == satelites used. Info is recorded for all SVs, used or not. Might be useful for GPS debugging.

Since this module creates the PX4IO object and that the IOCTL function
doesn't use the file descriptor parameter, there is no need to invoke
IOCTL via the filesystem since we can call it directly.

NuttX integration merge

Don't zero out the reported airspeed when below 15km/h