Fix(boards): 修复arduino mega pinout异常同时优化各板卡pinout相关block定义

boards/default_src/arduino_esp8266/generators/pinout.js

@@ -0,0 +1,5 @@
+export const esp8266_pin = function () {
+    return '';
+}
+
+export const wemos_d1_mini_pin = esp8266_pin;