launchdetector: add reset, #663
fw: reset landing and takeoff state if switched to manual
Merge remote-tracking branch 'upstream/master' into launchdetector

Conflicts:
	src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp
Merge pull request #710 from thomasgubler/launchdetector

FW: launchdetector reset
position_estimator_inav: hotfix, change lower dt limit from 5 ms to 2 ms
Merge branch 'master' into beta_mavlink2