* Disable mTECS, but retain code for now

* astyle fw_pos_control_l1

* fw_pos remove pitch_max_special only used by mtecs

* move FW_T_CLMB_MAX to FW TECS param group

* fw_pos initialize tecs_status_s

Bugfix:#3167 Nested parameter files under xxxx/yyyy/zzzz/kkkk are considered in the scope of xxxx/yyyy

Conflicts:
	src/lib/ecl

Conflicts:
	Tools/px_generate_params.py
	src/lib/ecl

* sdlog2: move from STAT.MainState to COMM.MainState

This fixes a bug where vehicle_system_status and the commander internal
state were conflicting.

This will need adaptations in logging tools.

* sdlog2: don't bother changing STAT.MainState

For compatibility reasons, let's stick to the used log field (but still
fix the bug where the buffer (union) was overwrittern.

same issue as in posix code: 64bit values are not atomic in general.

in detail:
- in the write method: the following are not necessarily atomic operations:
 	_last_update = hrt_absolute_time();
 	_generation++;
- appears_updated() was called with a lock held in some cases, but not
  in ioctl
- use the SmartLock class, so that unlock() is not needed before every
  return call. Makes it less error prone