Fix Firmware from STM32 to GD32

The essence of the problem is that there is firmware on the device with the STM32 processor, the source codes on github. It is necessary to fix it for the GD32 processor (clone from Gigadevice).

Details:
The device is a screen with a processor, like this: https://github.com/bigtreetech/BIGTREETECH-TouchScreenFirmware
PROCESSOR STM32F205 / GD32F250
It is desirable to make it work on both prots.

We wrote our firmware and our bootloader for this device.
The firmware consists of two parts - Bootloader and the program itself

Currently, if you flash the new screen with the current version, it will not start. Probably the bootloader doesnt work either.

(Theres a lot of information on the internet on the subject, such as (http://easyelectronics.ru/kontrollery-ot-gigadevice-gd32f103xxxx-popytka-migracii-s-stm32f103xxxx.html. Theres also an official compatibility dock from GD.)