take RCMAP parameters into account when displaying green bars on Radio Configuration screen

People use the RCMAP parameters to remap channels 1 ~ 4. People expect the displays on the radio calibration screen to change because we display "Roll", "Pitch",etc. When using RCMAP, the output of the channel data to the ground station doesn't change, instead only the meaning changes.

There are two solutions:
1. change arducopter, arduplane, ardurover so that when they send the radio input message to the ground station they change the mapping.
2. the mission planner is changed so that it uses the RCMAP to convert from the radio input message to the "Roll", "Pitch", "Yaw" and "Throttle" displayed on the Radio Calibration screen.

Start at the Radio Calibration screen and trace how radio input messages are turned into the displayed Roll, Pitch, Yaw, and Throttle values. Then inspect how RCMAP parameters are available to Mission Planner and determine which of the two proposed mapping approaches fits the project. Done means the green bars and labels reflect remapped channels 1–4 while the underlying radio input message remains unchanged.

Written by the indexing model from the issue text.