Fix implicitly deleted move constructors (#1954)

These were incorrect and exhibited as warnings on more recent versions of
clang (notably on Mac).

- Use pointers instead of references internally in GenericHID and *Drive
- Leave PIDBase, PIDController, and Resource non-moveable
- Remove the atomic from m_disabled in NidecBrushless
- Make Timer and Trigger copyable as well as moveable
- Implement custom move constructor/assignment for SendableChooserBase

Also comment out some unused variables that caused clang warnings.

wpilibc/src/main/native/include/frc/PIDBase.h

@@ -66,9 +66,6 @@ class PIDBase : public PIDInterface,
 
   virtual ~PIDBase() = default;
 
-  PIDBase(PIDBase&&) = default;
-  PIDBase& operator=(PIDBase&&) = default;
-
   /**
    * Return the current PID result.
    *