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/thread/wrap_ThreadModule.cpp

@@ -18,16 +18,20 @@
 * 3. This notice may not be removed or altered from any source distribution.
 **/
 
+// LOVE
 #include "wrap_ThreadModule.h"
 #include "wrap_LuaThread.h"
 #include "wrap_Channel.h"
-#include <filesystem/File.h>
-#include <filesystem/FileData.h>
+#include "ThreadModule.h"
+
+#include "filesystem/File.h"
+#include "filesystem/FileData.h"
 
 namespace love
 {
 namespace thread
 {
+
 static ThreadModule *instance = 0;
 
 int w_newThread(lua_State *L)
@@ -89,7 +93,7 @@ extern "C" int luaopen_love_thread(lua_State *L)
 	{
 		try
 		{
-			instance = new ThreadModule();
+			instance = new love::thread::ThreadModule();
 		}
 		catch (Exception & e)
 		{
@@ -108,5 +112,6 @@ extern "C" int luaopen_love_thread(lua_State *L)
 
 	return luax_register_module(L, w);
 }
-}
-}
+
+} // thread
+} // love