OFFBOARD switch added, WIP
commander: OFFBOARD mode added, WIP
OFFBOARD mode support in commander, mavlink, mc_att_control, WIP
added offboard data handling in mc_att_control_main.cpp
Revert "added offboard data handling in mc_att_control_main.cpp"

This reverts commit 6bb85a323ce7f152aead0c9133d86e5e900bd7ba.
Merge branch 'beta' into offboard
offboard setpoint support
Reverse offboard changes in mc_att_control
cammander, navigator: code style fixed
added check for MAIN_STATE_OFFBOARD @#1152 so that we dont get thrown out of this state
Added method to update _offboard in navigator_main.cpp
Added check for offboard_control_signal_lost when switching to offboard mode with rc switch
Revert "Added check for offboard_control_signal_lost when switching to offboard mode with rc switch"

This reverts commit 59a5f37b7feb0cecfdd983e88ce55931f3c1bce1.
Merge branch 'beta' into offboard2
Merge branch 'beta' into offboard2
Merge branch 'beta' into offboard2
Merge branch 'beta' into offboard2
Merge branch 'beta' into offboard2
commander: print_reject_mode() bug fixed
minor cosmetic changes