Namespace all wpilibc functions/classes into "frc" namespace. (#311)

Base.h provides a backwards compatibility shim (enabled unless
NAMESPACED_WPILIB is defined) that does a "using namespace frc".
However, as some header files do not include Base.h, this may
be a breaking change in some corner cases (with an easy fix).

Fixes #218.

wpilibc/shared/include/Buttons/Button.h

@@ -10,6 +10,8 @@
 #include "Buttons/Trigger.h"
 #include "Commands/Command.h"
 
+namespace frc {
+
 /**
  * This class provides an easy way to link commands to OI inputs.
  *
@@ -30,3 +32,5 @@ class Button : public Trigger {
   virtual void CancelWhenPressed(Command* command);
   virtual void ToggleWhenPressed(Command* command);
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/ButtonScheduler.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+namespace frc {
+
 class Trigger;
 class Command;
 
@@ -22,3 +24,5 @@ class ButtonScheduler {
   Trigger* m_button;
   Command* m_command;
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/CancelButtonScheduler.h

@@ -9,6 +9,8 @@
 
 #include "Buttons/ButtonScheduler.h"
 
+namespace frc {
+
 class Trigger;
 class Command;
 
@@ -21,3 +23,5 @@ class CancelButtonScheduler : public ButtonScheduler {
  private:
   bool pressedLast;
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/HeldButtonScheduler.h

@@ -9,6 +9,8 @@
 
 #include "Buttons/ButtonScheduler.h"
 
+namespace frc {
+
 class Trigger;
 class Command;
 
@@ -18,3 +20,5 @@ class HeldButtonScheduler : public ButtonScheduler {
   virtual ~HeldButtonScheduler() = default;
   virtual void Execute();
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/InternalButton.h

@@ -9,6 +9,8 @@
 
 #include "Buttons/Button.h"
 
+namespace frc {
+
 class InternalButton : public Button {
  public:
   InternalButton() = default;
@@ -24,3 +26,5 @@ class InternalButton : public Button {
   bool m_pressed = false;
   bool m_inverted = false;
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/JoystickButton.h

@@ -10,6 +10,8 @@
 #include "Buttons/Button.h"
 #include "GenericHID.h"
 
+namespace frc {
+
 class JoystickButton : public Button {
  public:
   JoystickButton(GenericHID* joystick, int buttonNumber);
@@ -21,3 +23,5 @@ class JoystickButton : public Button {
   GenericHID* m_joystick;
   int m_buttonNumber;
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/NetworkButton.h

@@ -12,6 +12,8 @@
 
 #include "Buttons/Button.h"
 
+namespace frc {
+
 class NetworkButton : public Button {
  public:
   NetworkButton(const std::string& tableName, const std::string& field);
@@ -24,3 +26,5 @@ class NetworkButton : public Button {
   std::shared_ptr<ITable> m_netTable;
   std::string m_field;
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/PressedButtonScheduler.h

@@ -9,6 +9,8 @@
 
 #include "Buttons/ButtonScheduler.h"
 
+namespace frc {
+
 class Trigger;
 class Command;
 
@@ -18,3 +20,5 @@ class PressedButtonScheduler : public ButtonScheduler {
   virtual ~PressedButtonScheduler() = default;
   virtual void Execute();
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/ReleasedButtonScheduler.h

@@ -9,6 +9,8 @@
 
 #include "Buttons/ButtonScheduler.h"
 
+namespace frc {
+
 class Trigger;
 class Command;
 
@@ -18,3 +20,5 @@ class ReleasedButtonScheduler : public ButtonScheduler {
   virtual ~ReleasedButtonScheduler() = default;
   virtual void Execute();
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/ToggleButtonScheduler.h

@@ -9,6 +9,8 @@
 
 #include "Buttons/ButtonScheduler.h"
 
+namespace frc {
+
 class Trigger;
 class Command;
 
@@ -21,3 +23,5 @@ class ToggleButtonScheduler : public ButtonScheduler {
  private:
   bool pressedLast;
 };
+
+}  // namespace frc

wpilibc/shared/include/Buttons/Trigger.h

@@ -12,6 +12,8 @@
 
 #include "SmartDashboard/Sendable.h"
 
+namespace frc {
+
 class Command;
 
 /**
@@ -48,3 +50,5 @@ class Trigger : public Sendable {
  protected:
   std::shared_ptr<ITable> m_table;
 };
+
+}  // namespace frc