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/drive/Vector2d.h

@@ -0,0 +1,49 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2017-2018 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 {
+
+/**
+ * This is a 2D vector struct that supports basic vector operations.
+ */
+struct Vector2d {
+  Vector2d() = default;
+  Vector2d(double x, double y);
+
+  /**
+   * Rotate a vector in Cartesian space.
+   *
+   * @param angle angle in degrees by which to rotate vector counter-clockwise.
+   */
+  void Rotate(double angle);
+
+  /**
+   * Returns dot product of this vector with argument.
+   *
+   * @param vec Vector with which to perform dot product.
+   */
+  double Dot(const Vector2d& vec) const;
+
+  /**
+   * Returns magnitude of vector.
+   */
+  double Magnitude() const;
+
+  /**
+   * Returns scalar projection of this vector onto argument.
+   *
+   * @param vec Vector onto which to project this vector.
+   */
+  double ScalarProject(const Vector2d& vec) const;
+
+  double x = 0.0;
+  double y = 0.0;
+};
+
+}  // namespace frc