Add love.mousefocus (partial issue #120) temporary name (see issue #573) and it's waiting for an exposed love.window to get a check, too

src/modules/event/sdl/Event.cpp

@@ -180,6 +180,8 @@ Message *Event::convert(SDL_Event &e)
 		arg1 = new Variant(e.active.gain != 0);
 		if (e.active.state & SDL_APPINPUTFOCUS)
 			msg = new Message("focus", arg1);
+		else if (e.active.state & SDL_APPMOUSEFOCUS)
+			msg = new Message("mousefocus", arg1);
 		arg1->release();
 		break;
 	case SDL_QUIT:

src/scripts/boot.lua

@@ -185,6 +185,9 @@ function love.createhandlers()
 		focus = function (f)
 			if love.focus then love.focus(f) end
 		end,
+		mousefocus = function (f)
+			if love.mousefocus then love.mousefocus(f) end
+		end,
 		quit = function ()
 			return
 		end,

src/scripts/boot.lua.h

@@ -327,6 +327,12 @@ const unsigned char boot_lua[] =
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