Add braces to C++ single-line loops and conditionals (NFC) (#2973)

This makes code easier to read and more consistent between C++ and Java.
Also update clang-format settings to always add a line break (even if no braces are used).

wpilibcExamples/src/main/cpp/examples/ArmBot/cpp/Robot.cpp

@@ -17,14 +17,18 @@ void Robot::RobotInit() {}
  * <p> This runs after the mode specific periodic functions, but before
  * LiveWindow and SmartDashboard integrated updating.
  */
-void Robot::RobotPeriodic() { frc2::CommandScheduler::GetInstance().Run(); }
+void Robot::RobotPeriodic() {
+  frc2::CommandScheduler::GetInstance().Run();
+}
 
 /**
  * This function is called once each time the robot enters Disabled mode. You
  * can use it to reset any subsystem information you want to clear when the
  * robot is disabled.
  */
-void Robot::DisabledInit() { m_container.DisablePIDSubsystems(); }
+void Robot::DisabledInit() {
+  m_container.DisablePIDSubsystems();
+}
 
 void Robot::DisabledPeriodic() {}
 
@@ -64,5 +68,7 @@ void Robot::TeleopPeriodic() {}
 void Robot::TestPeriodic() {}
 
 #ifndef RUNNING_FRC_TESTS
-int main() { return frc::StartRobot<Robot>(); }
+int main() {
+  return frc::StartRobot<Robot>();
+}
 #endif

wpilibcExamples/src/main/cpp/examples/ArmBot/cpp/RobotContainer.cpp

@@ -55,7 +55,9 @@ void RobotContainer::ConfigureButtonBindings() {
       .WhenReleased([this] { m_drive.SetMaxOutput(1); });
 }
 
-void RobotContainer::DisablePIDSubsystems() { m_arm.Disable(); }
+void RobotContainer::DisablePIDSubsystems() {
+  m_arm.Disable();
+}
 
 frc2::Command* RobotContainer::GetAutonomousCommand() {
   // Runs the chosen command in autonomous

wpilibcExamples/src/main/cpp/examples/ArmBot/cpp/subsystems/DriveSubsystem.cpp

@@ -35,9 +35,13 @@ double DriveSubsystem::GetAverageEncoderDistance() {
   return (m_leftEncoder.GetDistance() + m_rightEncoder.GetDistance()) / 2.;
 }
 
-frc::Encoder& DriveSubsystem::GetLeftEncoder() { return m_leftEncoder; }
+frc::Encoder& DriveSubsystem::GetLeftEncoder() {
+  return m_leftEncoder;
+}
 
-frc::Encoder& DriveSubsystem::GetRightEncoder() { return m_rightEncoder; }
+frc::Encoder& DriveSubsystem::GetRightEncoder() {
+  return m_rightEncoder;
+}
 
 void DriveSubsystem::SetMaxOutput(double maxOutput) {
   m_drive.SetMaxOutput(maxOutput);