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/MecanumControllerCommand/cpp/Robot.cpp

@@ -17,7 +17,9 @@ 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
@@ -64,5 +66,7 @@ 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/MecanumControllerCommand/cpp/subsystems/DriveSubsystem.cpp

@@ -77,7 +77,9 @@ frc::Encoder& DriveSubsystem::GetFrontLeftEncoder() {
   return m_frontLeftEncoder;
 }
 
-frc::Encoder& DriveSubsystem::GetRearLeftEncoder() { return m_rearLeftEncoder; }
+frc::Encoder& DriveSubsystem::GetRearLeftEncoder() {
+  return m_rearLeftEncoder;
+}
 
 frc::Encoder& DriveSubsystem::GetFrontRightEncoder() {
   return m_frontRightEncoder;
@@ -103,11 +105,17 @@ units::degree_t DriveSubsystem::GetHeading() const {
   return m_gyro.GetRotation2d().Degrees();
 }
 
-void DriveSubsystem::ZeroHeading() { m_gyro.Reset(); }
+void DriveSubsystem::ZeroHeading() {
+  m_gyro.Reset();
+}
 
-double DriveSubsystem::GetTurnRate() { return -m_gyro.GetRate(); }
+double DriveSubsystem::GetTurnRate() {
+  return -m_gyro.GetRate();
+}
 
-frc::Pose2d DriveSubsystem::GetPose() { return m_odometry.GetPose(); }
+frc::Pose2d DriveSubsystem::GetPose() {
+  return m_odometry.GetPose();
+}
 
 void DriveSubsystem::ResetOdometry(frc::Pose2d pose) {
   m_odometry.ResetPosition(pose, m_gyro.GetRotation2d());