Add JGAurora A5S and A1 (STM32F103ZET6) (#14291)

- Now compiles and works correctly with changes to HAL timers and watchdog.
- Does NOT include awesome work on touch screen function.
- Does have working LCD and SD-based EEPROM.

platformio.ini

@@ -349,6 +349,28 @@ lib_ignore    = c1921b4
   TMC26XStepper
   U8glib-HAL
 
+#
+# JGAurora A5S A1 (STM32F103ZET6)
+#
+[env:JGAURORA_A5S_A1]
+platform      = ststm32@5.3.0
+framework     = arduino
+board         = genericSTM32F103ZE
+extra_scripts = buildroot/share/PlatformIO/scripts/jgaurora_a5s_a1_with_bootloader.py
+build_flags   = !python Marlin/src/HAL/HAL_STM32F1/STM32F1_flag_script.py
+  ${common.build_flags} -DSTM32_XL_DENSITY
+src_filter    = ${common.default_src_filter} +<src/HAL/HAL_STM32F1>
+lib_deps      = ${common.lib_deps}
+lib_ignore    = c1921b4
+  libf3c
+  lib066
+  Adafruit NeoPixel_ID28
+  Adafruit NeoPixel
+  libf3e
+  TMC26XStepper
+lib_ldf_mode  = 1
+monitor_speed = 250000
+
 #
 # STM32F407VET6 with RAMPS-like shield
 # 'Black' STM32F407VET6 board - http://wiki.stm32duino.com/index.php?title=STM32F407