Merged SDL2 changes from bartbes/love-experiments/SDL2 into default.

- Added love.system module, including clipboard functions.

- Added custom hardware cursors (love.mouse.newCursor, love.mouse.setCursor.)

- Revamped love.joystick:
-- added Joystick objects and moved love.joystick functions which operated on individual joysticks to methods on the Joystick objects.
-- Added love.joystick.getJoystick and love.joystick.getJoystickCount.
-- Added events for when joysticks are connected and disconnected.
-- Added 'Gamepad' methods to Joystick objects: Joystick:isGamepad, Joystick:getGamepadAxis, and Joystick:isGamepadDown. They're a common abstraction for xbox controller-like joystick across operating systems.

- Added monitor choosing support and "fullscreen desktop" mode to love.window.

- Moved unicode text input events to their own callback function (love.textinput), removed the key repeat functions from love.keyboard and made the second argument of love.keypressed a boolean saying whether the keypress was a repeat.

- liblove now works with love.window and love.graphics in OS X

src/modules/keyboard/sdl/Keyboard.h

@@ -28,6 +28,9 @@
 // SDL
 #include <SDL.h>
 
+// STL
+#include <map>
+
 namespace love
 {
 namespace keyboard
@@ -42,14 +45,11 @@ public:
 	// Implements Module.
 	const char *getName() const;
 	bool isDown(Key *keylist) const;
-	void setKeyRepeat(int delay, int interval) const;
-	int getKeyRepeatDelay() const;
-	int getKeyRepeatInterval() const;
 
 private:
 
-	static EnumMap<Key, SDLKey, Keyboard::KEY_MAX_ENUM>::Entry keyEntries[];
-	static EnumMap<Key, SDLKey, Keyboard::KEY_MAX_ENUM> keys;
+	static std::map<Key, SDL_Keycode> createKeyMap();
+	static std::map<Key, SDL_Keycode> keys;
 
 }; // Keyboard