[commands] C++ unique_ptr migration (#4319)

Add a CommandPtr with an internal unique_ptr to enable not needing to move the underlying classes, which is error-prone due to the potential for lambda captures.

wpilibNewCommands/src/main/native/cpp/frc2/command/button/Button.cpp

@@ -13,6 +13,11 @@ Button Button::WhenPressed(Command* command) {
   return *this;
 }
 
+Button Button::WhenPressed(CommandPtr&& command) {
+  WhenActive(std::move(command));
+  return *this;
+}
+
 Button Button::WhenPressed(std::function<void()> toRun,
                            std::initializer_list<Subsystem*> requirements) {
   WhenActive(std::move(toRun), requirements);
@@ -30,6 +35,11 @@ Button Button::WhileHeld(Command* command) {
   return *this;
 }
 
+Button Button::WhileHeld(CommandPtr&& command) {
+  WhileActiveContinous(std::move(command));
+  return *this;
+}
+
 Button Button::WhileHeld(std::function<void()> toRun,
                          std::initializer_list<Subsystem*> requirements) {
   WhileActiveContinous(std::move(toRun), requirements);
@@ -47,11 +57,21 @@ Button Button::WhenHeld(Command* command) {
   return *this;
 }
 
+Button Button::WhenHeld(CommandPtr&& command) {
+  WhileActiveOnce(std::move(command));
+  return *this;
+}
+
 Button Button::WhenReleased(Command* command) {
   WhenInactive(command);
   return *this;
 }
 
+Button Button::WhenReleased(CommandPtr&& command) {
+  WhenInactive(std::move(command));
+  return *this;
+}
+
 Button Button::WhenReleased(std::function<void()> toRun,
                             std::initializer_list<Subsystem*> requirements) {
   WhenInactive(std::move(toRun), requirements);
@@ -69,6 +89,11 @@ Button Button::ToggleWhenPressed(Command* command) {
   return *this;
 }
 
+Button Button::ToggleWhenPressed(CommandPtr&& command) {
+  ToggleWhenActive(std::move(command));
+  return *this;
+}
+
 Button Button::CancelWhenPressed(Command* command) {
   CancelWhenActive(command);
   return *this;