RX5808 receiver ESP32 version

The hardware design adopts upper and lower layer design. The upper layer is the control circuit and the lower layer is the dual receiving circuit.
The interface design is based on LVGL. The main functions are as follows:

1) Long press the OK button on the main interface to lock/unlock the manual channel, short press to enter the menu; when unlocked, press up, down, left, and right to adjust the frequency.
2) The menu interface is divided into three parts: Scan; Settings; About.
Press up or down to switch menu options, confirm to enter the submenu, left click to return to the main interface
3) The scan menu has three sub-contents:
-Graph scan displays the signal strength of the frequency 5300-5900MHz;
-Table scan displays the signal strength of the image transmission channel in different colors, After the scan is completed, the frequency is switched to the channel with the best current signal strength and is displayed in the upper right corner;
-RSSI calibration is used to calibrate RSSI. If image transmission is not turned on, the calibration will fail. If successful, the result will be saved.
4) The setting interface can set the display backlight intensity, boot animation, and whether the buzzer is turned on.
5) About the interface display related information

For the ESP32 version, the pin order remains unchanged and is compatible with STM32:

- Added Chinese, you can select the system language in the setting item, the Chinese interface is as follows:
- Added output signal source settings, select receiver 1 or 2 to change to single receiving mode, so you can also weld only one piece of RX5808 to make a single receiver;