Move CameraServer and WPILib headers into their own folder

The old headers were moved into folders because doing so avoids polluting
the system include directories.

Folder names were also normalized to lowercase.

hal/src/test/native/cpp/sim/SimInitializationTest.cpp

@@ -0,0 +1,49 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "gtest/gtest.h"
+#include "hal/HAL.h"
+#include "simulation/AccelerometerSim.h"
+#include "simulation/AnalogGyroSim.h"
+#include "simulation/AnalogInSim.h"
+#include "simulation/AnalogOutSim.h"
+#include "simulation/AnalogTriggerSim.h"
+#include "simulation/DIOSim.h"
+#include "simulation/DigitalPWMSim.h"
+#include "simulation/DriverStationSim.h"
+#include "simulation/EncoderSim.h"
+#include "simulation/PCMSim.h"
+#include "simulation/PDPSim.h"
+#include "simulation/PWMSim.h"
+#include "simulation/RelaySim.h"
+#include "simulation/RoboRioSim.h"
+#include "simulation/SPIAccelerometerSim.h"
+
+using namespace frc::sim;
+
+namespace hal {
+
+TEST(SimInitializationTests, TestAllInitialize) {
+  HAL_Initialize(500, 0);
+  AccelerometerSim acsim{0};
+  AnalogGyroSim agsim{0};
+  AnalogInSim aisim{0};
+  AnalogOutSim aosim{0};
+  AnalogTriggerSim atsim{0};
+  DigitalPWMSim dpsim{0};
+  DIOSim diosim{0};
+  DriverStationSim dssim;
+  (void)dssim;
+  EncoderSim esim{0};
+  PCMSim pcmsim{0};
+  PDPSim pdpsim{0};
+  PWMSim pwmsim{0};
+  RelaySim rsim{0};
+  RoboRioSim rrsim{0};
+  SPIAccelerometerSim sasim{0};
+}
+}  // namespace hal