Add helicopter absolute and relative integration code

[adamv17]

It may be beneficial to combine the two sensors together to close a loop on the position. The relative integrated encoder in the TalonFX is vulnerable to gear slippage and backlash as it is positioned at the bottom of the gearbox (with a crazy gear ratio in between). Meanwhile, the absolute encoder has a theoretical one to one ratio to the true helicopter position, but truly the gears turning are plastic and not the actual subsystem. Fortunately, a combination of the two might give us an accurate position of the helicopter. An idea to solve this is adding some kind of filter:
input1 - absolute ---> |black box filter| ---> output - true absolute
input2 - relative ----->|________________|