Document drivetrain code

[jkleiber]

Summary
It would be good to know what our code does. The C++ code currently has little/no docstrings for each function.

The objective of this ticket is to add docstrings to the header files of the drivetrain code. This includes Drivetrain.h and DrivetrainIO.h. In each header file, each function should have a docstring that looks like this:

/**
 * Summary of what this function does
 *
 * @param arg1 Description of arg1
 * @param arg2 Description of arg2
 * ...
 * @param argN Description of argN
 * @return Description of what returns (and in some cases why)
 */
return_type function_name(data_type arg1, data_type arg2, ..., data_type argN);

So for example:

/**
 * Sets the speed modifier variable used to scale the power of user input.
 * 
 * @param speed_mod New speed modifier to set
 * @return True on success, false on failure
 */
bool SetSpeedModifier(const double &speed_mod);

Work To Do

• Add docstrings in the prescribed format for the drivetrain code

Verification

• Inspection

Deferred Work

• Use doxygen to compile the documentation into an API