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/system/sdl/System.cpp

@@ -0,0 +1,91 @@
+/**
+ * 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.
+ **/
+
+// LOVE
+#include "System.h"
+
+// SDL
+#include <SDL_clipboard.h>
+#include <SDL_cpuinfo.h>
+
+namespace love
+{
+namespace system
+{
+namespace sdl
+{
+
+System::System()
+{
+}
+
+const char *System::getName() const
+{
+	return "love.system.sdl";
+}
+
+int System::getProcessorCount() const
+{
+	return SDL_GetCPUCount();
+}
+
+void System::setClipboardText(const std::string &text) const
+{
+	SDL_SetClipboardText(text.c_str());
+}
+
+std::string System::getClipboardText() const
+{
+	std::string text("");
+
+	char *ctext = SDL_GetClipboardText();
+	if (ctext)
+	{
+		text = std::string(ctext);
+		SDL_free(ctext);
+	}
+
+	return text;
+}
+
+love::system::System::PowerState System::getPowerInfo(int &seconds, int &percent) const
+{
+	SDL_PowerState sdlstate = SDL_GetPowerInfo(&seconds, &percent);
+
+	PowerState state = POWER_UNKNOWN;
+	powerStates.find(sdlstate, state);
+
+	return state;
+}
+
+EnumMap<System::PowerState, SDL_PowerState, System::POWER_MAX_ENUM>::Entry System::powerEntries[] =
+{
+	{System::POWER_UNKNOWN, SDL_POWERSTATE_UNKNOWN},
+	{System::POWER_BATTERY, SDL_POWERSTATE_ON_BATTERY},
+	{System::POWER_NO_BATTERY, SDL_POWERSTATE_NO_BATTERY},
+	{System::POWER_CHARGING, SDL_POWERSTATE_CHARGING},
+	{System::POWER_CHARGED, SDL_POWERSTATE_CHARGED},
+};
+
+EnumMap<System::PowerState, SDL_PowerState, System::POWER_MAX_ENUM> System::powerStates(System::powerEntries, sizeof(System::powerEntries));
+
+} // sdl
+} // system
+} // love

src/modules/system/sdl/System.h

@@ -0,0 +1,66 @@
+/**
+ * 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_SYSTEM_SDL_SYSTEM_H
+#define LOVE_SYSTEM_SDL_SYSTEM_H
+
+// LOVE
+#include "system/System.h"
+#include "common/EnumMap.h"
+
+// SDL
+#include <SDL_power.h>
+
+namespace love
+{
+namespace system
+{
+namespace sdl
+{
+
+class System : public love::system::System
+{
+public:
+
+	System();
+	virtual ~System() {}
+
+	// Implements Module.
+	const char *getName() const;
+
+	int getProcessorCount() const;
+
+	void setClipboardText(const std::string &text) const;
+	std::string getClipboardText() const;
+
+	PowerState getPowerInfo(int &seconds, int &percent) const;
+
+private:
+
+	static EnumMap<PowerState, SDL_PowerState, POWER_MAX_ENUM>::Entry powerEntries[];
+	static EnumMap<PowerState, SDL_PowerState, POWER_MAX_ENUM> powerStates;
+
+}; // System
+
+} // sdl
+} // system
+} // love
+
+#endif // LOVE_SYSTEM_SDL_SYSTEM_H