The locking seems to be broken, therefore refrain from using it.

switch the modules implementing the block structure to px4_poll such that in posix_sitl simulation the poll works as expected, blocks the module and doesn't overload the CPU

improved position based flow correction for lpe

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Corrected magnetometer gain and alignment, added support for sensitivity adjustment values, cleaned up debugging messages and removed dead code.

Significant work on mpu9250 driver to get magnetometer updates happening reliably. Improved 'mag' utility to aid driver development and testing.

Add new system command to monitor the magnetometer uORB publication, in order to see MPU9250 driver mag output