mtecs: add altitude prefiltering
Check if waypoint altitude is relative. Fixes #1197
navigator: Feedback strings / text and logic was not consistent in previous state, fixed.
uORB: Add navigation state
Log nav mode
Enable nav mode logging in navigator
Merge pull request #1202 from PX4/mtecsaltitudefilter

mtecs: add altitude prefiltering
Merge pull request #1199 from PX4/navlogfix

Nav log fix
Merge pull request #1198 from PX4/wpwarningfix

Check if waypoint altitude is relative. Fixes #1197
BlockDerivative: initialize in first run
Derivative fix: Comments and code style
Merge pull request #1203 from PX4/initderivativeblock

BlockDerivative: initialize in first run
Remove all unused TECS parameters
Remove one left-over TECS param
Remove all handles to TECS params in startup scripts
Remove MT_ENABLED param and handles
Remove last reference to mtecs enabled param
Merge pull request #1204 from PX4/tecs-cleanup

Remove all unused TECS parameters
Revert "Remove last reference to mtecs enabled param"

This reverts commit 81f60329e47f8b31d9261c0ef46c09780f9d8194.
Revert "Remove MT_ENABLED param and handles"

This reverts commit 90a5ae1afd25e5e31d269f0d0f5e5052f068d0b1.