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/joystick/sdl/JoystickModule.h

@@ -0,0 +1,81 @@
+/**
+ * Copyright (c) 2006-2013 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#ifndef LOVE_JOYSTICK_SDL_JOYSTICK_MODULE_H
+#define LOVE_JOYSTICK_SDL_JOYSTICK_MODULE_H
+
+// LOVE
+#include "joystick/JoystickModule.h"
+
+// STL
+#include <string>
+#include <map>
+
+namespace love
+{
+namespace joystick
+{
+namespace sdl
+{
+
+class JoystickModule : public love::joystick::JoystickModule
+{
+public:
+
+	JoystickModule();
+	virtual ~JoystickModule();
+
+	// Implements Module.
+	const char *getName() const;
+
+	// Implements JoystickModule.
+	love::joystick::Joystick *addJoystick(int deviceindex);
+	void removeJoystick(love::joystick::Joystick *joystick);
+	love::joystick::Joystick *getJoystickFromID(int instanceid);
+	love::joystick::Joystick *getJoystick(int joyindex);
+	int getIndex(const love::joystick::Joystick *joystick);
+	int getJoystickCount() const;
+	bool isGamepad(int joyindex) const;
+	bool setGamepadMapping(const std::string &guid, Joystick::GamepadInput gpinput, Joystick::JoystickInput joyinput);
+	Joystick::JoystickInput getGamepadMapping(const std::string &guid, Joystick::GamepadInput gpinput);
+
+private:
+
+	std::string stringFromGamepadInput(Joystick::GamepadInput gpinput) const;
+	Joystick::JoystickInput JoystickInputFromString(const std::string &str) const;
+	void removeBindFromMapString(std::string &mapstr, const std::string &joybindstr) const;
+	void checkGamepads(const std::string &guid) const;
+
+	// SDL2's GUIDs identify *classes* of devices, instead of unique devices.
+	std::string getDeviceGUID(int deviceindex) const;
+
+	// Lists of currently connected Joysticks.
+	std::vector<Joystick *> activeSticks;
+
+	// Persistent list of all Joysticks which have been connected at some point.
+	std::vector<Joystick *> joysticks;
+
+}; // JoystickModule
+
+} // sdl
+} // joystick
+} // love
+
+#endif // LOVE_JOYSTICK_SDL_JOYSTICK_MODULE_H