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/Cursor.h

@@ -0,0 +1,100 @@
+/**
+ * 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_CURSOR_H
+#define LOVE_MOUSE_CURSOR_H
+
+// LOVE
+#include "image/ImageData.h"
+#include "common/Object.h"
+#include "common/StringMap.h"
+
+namespace love
+{
+namespace mouse
+{
+
+class Cursor : public Object
+{
+public:
+
+	// Types of system cursors.
+	enum SystemCursor
+	{
+		CURSOR_ARROW,
+		CURSOR_IBEAM,
+		CURSOR_WAIT,
+		CURSOR_CROSSHAIR,
+		CURSOR_WAITARROW,
+		CURSOR_SIZENWSE,
+		CURSOR_SIZENESW,
+		CURSOR_SIZEWE,
+		CURSOR_SIZENS,
+		CURSOR_SIZEALL,
+		CURSOR_NO,
+		CURSOR_HAND,
+		CURSOR_MAX_ENUM
+	};
+
+	enum CursorType
+	{
+		CURSORTYPE_SYSTEM,
+		CURSORTYPE_IMAGE,
+		CURSORTYPE_MAX_ENUM
+	};
+
+	virtual ~Cursor();
+
+	/**
+	 * Returns a pointer to the implementation-dependent handle of this Cursor.
+	 **/
+	virtual void *getHandle() const = 0;
+
+	/**
+	 * Returns whether this Cursor is system-defined or a custom image.
+	 **/
+	virtual CursorType getType() const = 0;
+
+	/**
+	 * Returns the type type of system cursor used, if this Cursor is using a
+	 * system-defined image.
+	 **/
+	virtual SystemCursor getSystemType() const = 0;
+
+	static bool getConstant(const char *in, SystemCursor &out);
+	static bool getConstant(SystemCursor in, const char *&out);
+
+	static bool getConstant(const char *in, CursorType &out);
+	static bool getConstant(CursorType in, const char *&out);
+
+private:
+
+	static StringMap<SystemCursor, CURSOR_MAX_ENUM>::Entry systemCursorEntries[];
+	static StringMap<SystemCursor, CURSOR_MAX_ENUM> systemCursors;
+
+	static StringMap<CursorType, CURSORTYPE_MAX_ENUM>::Entry typeEntries[];
+	static StringMap<CursorType, CURSORTYPE_MAX_ENUM> types;
+
+};
+
+} // mouse
+} // love
+
+#endif // LOVE_MOUSE_CURSOR_H