Convert the main menu screen to lua lol

lib/esp-idf-lua/examples/vfs/spiffs_image/hello.lua

@@ -0,0 +1,11 @@
+local hello = {}
+
+function hello.world()
+  return "Hello world!"
+end
+
+function hello.lorem_ipsum()
+  return "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
+end
+
+return hello

lib/esp-idf-lua/examples/vfs/spiffs_image/hex.lua

@@ -0,0 +1,13 @@
+local hex = {}
+
+function hex.dump(buf)
+  for byte=1, #buf, 16 do
+    local chunk = buf:sub(byte, byte+15)
+    io.write(string.format('%08X  ',byte-1))
+    chunk:gsub('.', function (c) io.write(string.format('%02X ',string.byte(c))) end)
+    io.write(string.rep(' ',3*(16-#chunk)))
+    io.write(' ',chunk:gsub('%c','.'),"\n")
+  end
+end
+
+return hex

lib/esp-idf-lua/examples/vfs/spiffs_image/main.lua

@@ -0,0 +1,6 @@
+local hello = require "hello"
+local hex = require "hex"
+
+print(hello.world())
+
+hex.dump(hello.lorem_ipsum())