Fork of rtl_443_ESP to experiment with getting current cost device working.

Works ok but not tested with any other devices, purely an experiment and no plans to add other devices etc.

No attempt to tune sx1278 parameters as FSK reception worked with this device out of the box.

Code changes marked with #ifdef ENABLE_FSK_PULSE_PCM

Had to update current_cost.c so it doesn't put the packet buffer on the stack.

For openmqttgateway

for platformio.ini

changed rtl_433_ESP to

rtl_433_ESP = https://github.com/cartwrightian/rtl_433_ESP_ic

for environments.ini, updated env:lilygo-rtl_433

[env:lilygo-rtl_433]
;build_type = debug not helping
platform = ${com.esp32_platform}
board = ttgo-lora32-v21
; https://docs.platformio.org/en/latest/boards/espressif32/ttgo-lora32-v2.html
; ~/.platformio/packages/framework-arduinoespressif32/variants/.../pins_arduino.h
board_build.partitions = min_spiffs.csv
lib_deps =
  ${com-esp.lib_deps}
  ${libraries.wifimanager32}
  ${libraries.ssd1306}
  ${libraries.rtl_433_ESP}
build_flags =
  ${com-esp.build_flags}
; *** OpenMQTTGateway Config ***
  ;'-UZmqttDiscovery'          ; disables MQTT Discovery
  '-DvalueAsATopic=true'    ; MQTT topic includes model and device
  '-DGateway_Name="OpenMQTTGateway_lilygo_rtl_433_ESP"'
; *** OpenMQTTGateway Modules ***
  '-DZgatewayRTL_433="rtl_433"'
  '-DZradioSX127x="SX127x"'
; *** ssd1306 Display Options ***
  '-DZdisplaySSD1306="LilyGo_SSD1306"'
;  '-DLOG_TO_OLED=true'         ; Enable log to OLED
;  '-DJSON_TO_OLED=true'
;  '-DLOG_LEVEL_OLED=LOG_LEVEL_INFO'
;  '-DDISPLAY_IDLE_LOGO=false'
;  '-DDISPLAY_BRIGHTNESS=80'
;  '-DDISPLAY_METRIC=false'
;  '-DRTL_DEBUG=1'             ; rtl_433 verbose mode
;  '-DDEMOD_DEBUG'
  '-DMY_DEVICES=true'
  '-DENABLE_FSK_PULSE_PCM=true'
  ;'-DPUBLISH_UNPARSED=true'
;  '-DCURRENT_COST_DEBUG=true'
;  '-DRF_MODULE_INIT_STATUS'