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/PIDController.h

@@ -102,9 +102,6 @@ class PIDController : public PIDBase, public Controller {
 
   ~PIDController() override;
 
-  PIDController(PIDController&&) = default;
-  PIDController& operator=(PIDController&&) = default;
-
   /**
    * Begin running the PIDController.
    */