Added love.lowmemory event callback function, called when the app is close to running out of memory on iOS and Android.

--HG--
branch : minor

src/modules/event/sdl/Event.cpp

@@ -362,6 +362,9 @@ Message *Event::convert(const SDL_Event &e) const
 	case SDL_APP_TERMINATING:
 		msg = new Message("quit");
 		break;
+	case SDL_APP_LOWMEMORY:
+		msg = new Message("lowmemory");
+		break;
 	default:
 		break;
 	}

src/scripts/boot.lua

@@ -211,7 +211,7 @@ function love.createhandlers()
 		joystickadded = function (j)
 			if love.joystickadded then return love.joystickadded(j) end
 		end,
-		joystickremoved = function(j)
+		joystickremoved = function (j)
 			if love.joystickremoved then return love.joystickremoved(j) end
 		end,
 		focus = function (f)
@@ -229,7 +229,7 @@ function love.createhandlers()
 		threaderror = function (t, err)
 			if love.threaderror then return love.threaderror(t, err) end
 		end,
-		resize = function(w, h)
+		resize = function (w, h)
 			if love.resize then return love.resize(w, h) end
 		end,
 		filedropped = function (f)
@@ -238,6 +238,10 @@ function love.createhandlers()
 		directorydropped = function (dir)
 			if love.directorydropped then return love.directorydropped(dir) end
 		end,
+		lowmemory = function ()
+			collectgarbage()
+			if love.lowmemory then return love.lowmemory() end
+		end,
 	}, {
 		__index = function(self, name)
 			error("Unknown event: " .. name)

src/scripts/boot.lua.h

@@ -396,7 +396,7 @@ const unsigned char boot_lua[] =
 	0x64, 0x28, 0x6a, 0x29, 0x20, 0x65, 0x6e, 0x64, 0x0a,
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+	0x3d, 0x20, 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x28, 0x6a, 0x29, 0x0a,
 	0x09, 0x09, 0x09, 0x69, 0x66, 0x20, 0x6c, 0x6f, 0x76, 0x65, 0x2e, 0x6a, 0x6f, 0x79, 0x73, 0x74, 0x69, 0x63, 
 	0x6b, 0x72, 0x65, 0x6d, 0x6f, 0x76, 0x65, 0x64, 0x20, 0x74, 0x68, 0x65, 0x6e, 0x20, 0x72, 0x65, 0x74, 0x75, 
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@@ -433,7 +433,7 @@ const unsigned char boot_lua[] =
 	0x20, 0x65, 0x72, 0x72, 0x29, 0x20, 0x65, 0x6e, 0x64, 0x0a,
 	0x09, 0x09, 0x65, 0x6e, 0x64, 0x2c, 0x0a,
 	0x09, 0x09, 0x72, 0x65, 0x73, 0x69, 0x7a, 0x65, 0x20, 0x3d, 0x20, 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 
-	0x6e, 0x28, 0x77, 0x2c, 0x20, 0x68, 0x29, 0x0a,
+	0x6e, 0x20, 0x28, 0x77, 0x2c, 0x20, 0x68, 0x29, 0x0a,
 	0x09, 0x09, 0x09, 0x69, 0x66, 0x20, 0x6c, 0x6f, 0x76, 0x65, 0x2e, 0x72, 0x65, 0x73, 0x69, 0x7a, 0x65, 0x20, 
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@@ -452,6 +452,14 @@ const unsigned char boot_lua[] =
 	0x75, 0x72, 0x6e, 0x20, 0x6c, 0x6f, 0x76, 0x65, 0x2e, 0x64, 0x69, 0x72, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x79, 
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