Convert the main menu screen to lua lol

lib/luavgl/examples/protectedcall.lua

@@ -0,0 +1,36 @@
+
+local function testCrash()
+    print(nil .. "")
+end
+
+local function testCrash2()
+    testCrash()
+end
+local function testCrash3()
+    testCrash2()
+end
+local function testCrash4()
+    testCrash3()
+end
+
+local function testCrash5()
+    testCrash4()
+end
+
+local function testCrash6()
+    testCrash5()
+end
+
+lvgl.Label(nil, {
+    text = "crash in 1 second.",
+    align = lvgl.ALIGN.CENTER
+})
+
+lvgl.Timer {
+    period = 1000,
+    cb = function(t)
+        t:delete()
+        -- crash in callback function is protected.
+        testCrash6()
+    end
+}