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.

wpilibc/src/main/native/include/frc/Controller.h

@@ -0,0 +1,35 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2008-2018 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.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#pragma once
+
+namespace frc {
+
+/**
+ * Interface for Controllers.
+ *
+ * Common interface for controllers. Controllers run control loops, the most
+ * common are PID controllers and their variants, but this includes anything
+ * that is controlling an actuator in a separate thread.
+ */
+class Controller {
+ public:
+  virtual ~Controller() = default;
+
+  /**
+   * Allows the control loop to run
+   */
+  virtual void Enable() = 0;
+
+  /**
+   * Stops the control loop from running until explicitly re-enabled by calling
+   * enable()
+   */
+  virtual void Disable() = 0;
+};
+
+}  // namespace frc