DUNE/IMC: Synchronized with IMC release/5.4.x.
DUNE/Tasks: Added support for multiple binds to the same message.
DUNE/IMC: Removed message AbortAcked.
Sensors/MLBLTracker: allow to send plans with up to 31 characters.
Sensors/MLBL: decode start plan message with up to 31 characters.
Transports/SUNSET: Replaced snprintf() with String::str().
Config: manta-1: Added Iridium power channel.
Config: manta-1: Replaced LC2M power channel with Iridium.
WWW: Removed obsolete files.
Sensors/Edgetech2205: All output operations happen at the end of the file, appending to its existing contents.
Sensors/Imagenex837B: All output operations happen at the end of the file, appending to its existing contents.
Merge branch 'master' into feature/formationflight

Conflicts:
	etc/xml/IMC.xml
	programs/tests/test_IMC.cpp
	src/DUNE/IMC/Blob.cpp
	src/DUNE/IMC/Constants.hpp
	src/DUNE/IMC/Definitions.cpp
	src/DUNE/IMC/Factory.def
	src/DUNE/IMC/Macros.hpp
DUNE/IMC: Added altitude constraints to the 'Formation' message. (imcjava hash: fe968a146ed0031bac835e276cee4aedcb2ace8f)
DUNE/Tasks: Correction to the task deactivation process.
Simulators/UAV: Correction of the initial altitude.
Maneuver/VehicleFormation/Coordinator: The formation controller is now activated throught the 'Formation' message. Addition of altitude constraints verification. Removal of redundant parameters. Update of the process to compute the number of vehicles in the formation.
Maneuver/VehicleFormation/FormCollAvoid: The formation controller is now activated throught the 'Formation' message. Addition of distinct constraints for the vehicle and the leader. Reorganization of the parameters update function. Removal of redundant parameters. Parameters update function now keeps the data for the vehicles that remain in the formation after a formation composition change.
Config: uav/formation: Removal of deprecated formation controller parameters.
Config: x8-04: Removal of deprecated formation controller parameters.
Config: x8-02: Removal of deprecated formation controller parameters.