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/mouse/sdl/Cursor.h

@@ -0,0 +1,64 @@
+/**
+ * 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_MOUSE_SDL_CURSOR_H
+#define LOVE_MOUSE_SDL_CURSOR_H
+
+// LOVE
+#include "mouse/Cursor.h"
+#include "common/EnumMap.h"
+
+// SDL
+#include <SDL_mouse.h>
+
+namespace love
+{
+namespace mouse
+{
+namespace sdl
+{
+
+class Cursor : public love::mouse::Cursor
+{
+public:
+
+	Cursor(image::ImageData *imageData, int hotx, int hoty);
+	Cursor(SystemCursor cursortype);
+	~Cursor();
+
+	void *getHandle() const;
+	CursorType getType() const;
+	SystemCursor getSystemType() const;
+
+private:
+
+	SDL_Cursor *cursor;
+	CursorType type;
+	SystemCursor systemType;
+
+	static EnumMap<SystemCursor, SDL_SystemCursor, CURSOR_MAX_ENUM>::Entry systemCursorEntries[];
+	static EnumMap<SystemCursor, SDL_SystemCursor, CURSOR_MAX_ENUM> systemCursors;
+};
+
+} // sdl
+} // mouse
+} // love
+
+#endif // LOVE_MOUSE_SDL_CURSOR_H