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/window/Window.cpp

@@ -40,13 +40,35 @@ void Window::swapBuffers()
 
 WindowFlags::WindowFlags()
 	: fullscreen(false)
+	, fstype(Window::FULLSCREEN_TYPE_NORMAL)
 	, vsync(true)
 	, fsaa(0)
 	, resizable(false)
+	, minwidth(100)
+	, minheight(100)
 	, borderless(false)
 	, centered(true)
+	, display(0)
 {
 }
 
+bool Window::getConstant(const char *in, Window::FullscreenType &out)
+{
+	return fullscreenTypes.find(in, out);
+}
+
+bool Window::getConstant(Window::FullscreenType in, const char *&out)
+{
+	return fullscreenTypes.find(in, out);
+}
+
+StringMap<Window::FullscreenType, Window::FULLSCREEN_TYPE_MAX_ENUM>::Entry Window::fullscreenTypeEntries[] =
+{
+	{"normal", Window::FULLSCREEN_TYPE_NORMAL},
+	{"desktop", Window::FULLSCREEN_TYPE_DESKTOP},
+};
+
+StringMap<Window::FullscreenType, Window::FULLSCREEN_TYPE_MAX_ENUM> Window::fullscreenTypes(Window::fullscreenTypeEntries, sizeof(Window::fullscreenTypeEntries));
+
 } // window
 } // love