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/buttons/Trigger.h

@@ -34,8 +34,10 @@ class Trigger : public Sendable, public SendableHelper<Trigger> {
   Trigger() = default;
   ~Trigger() override = default;
 
-  Trigger(Trigger&&) = default;
-  Trigger& operator=(Trigger&&) = default;
+  Trigger(const Trigger& rhs);
+  Trigger& operator=(const Trigger& rhs);
+  Trigger(Trigger&& rhs);
+  Trigger& operator=(Trigger&& rhs);
 
   bool Grab();
   virtual bool Get() = 0;