Global: Responding to warning cs0612

[muramura]

I want to change the warning CS0612. I want to reduce the warning. I want to clarify the real warnings from the many warnings.

[AppVeyorBot]

:white_check_mark: Build MissionPlanner 1.0.2645 completed (commit https://github.com/ArduPilot/MissionPlanner/commit/3198f689e5 by @muramura)

[meee1]

i think there are issues with this one, there are multiple things tag obsolete that i dont think should be

[muramura]

So displaying a warning would encourage people to fix it, which is what we're doing now. I understood that this in itself is really a warning to change.