sdlog2: move some global variables to local scope, set default log rate to 50 Hz
sdlog2: lseek() workaround removed
sdlog2: bug fixed, sleep when idle too
sdlog2: max write chunk increased to 1024
Revert "sdlog2: max write chunk increased to 1024"

This reverts commit a478dac621301a993fb8ed13b86abd61d93bfec0.
mavlink: RC_CHANNELS_RAW added to default streams set
Merge branch 'master' into beta_mavlink2
Merge pull request #710 from thomasgubler/launchdetector

FW: launchdetector reset
dumpfile command and fetch_log.py tool implemented to fetch logs via nsh console on USB
Fix code style of mb12xx driver, no functional changes
launchdetection: better integration of Blocks class
Merge branch 'getopt_fixes' into sdlog2_opt
Merge branch 'master' into gpio_led_fmuv2
geofence: make better use of Block class for updating parameters
Merge branch 'master' into acro2
Added support for driver rangefinder
Complete output parsing, pending testing
Allow to set the UART via start argument, cleanups
Add missing CDev init step
SF02/F operational, but not cleaned up / optimized - good enough for first logging