Load esptool.py from submodule, currently WIP esptool.py v2.0

More details at espressif/esptool#121

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "components/esp32/lib"]
 	path = components/esp32/lib
 	url = https://github.com/espressif/esp32-wifi-lib.git
+[submodule "components/esptool_py/esptool"]
+	path = components/esptool_py/esptool
+	url = https://github.com/themadinventor/esptool.git

add_path.sh

@@ -9,7 +9,7 @@
 if [ -z ${IDF_PATH} ]; then
 	echo "IDF_PATH must be set before including this script."
 else
-	IDF_ADD_PATHS_EXTRAS="${IDF_PATH}/components/esptool_py/:${IDF_PATH}/components/partition_table/"
+	IDF_ADD_PATHS_EXTRAS="${IDF_PATH}/components/esptool_py/esptool:${IDF_PATH}/components/partition_table/"
 	export PATH="${PATH}:${IDF_ADD_PATHS_EXTRAS}"
 	echo "Added to PATH: ${IDF_ADD_PATHS_EXTRAS}"
 fi

components/esptool_py/Makefile.projbuild

@@ -9,10 +9,11 @@ PYTHON ?= $(call dequote,$(CONFIG_PYTHON))
 # to invoke esptool.py (with or without serial port args)
 #
 # NB: esptool.py lives in the sdk/bin directory not the component directory
-ESPTOOLPY := $(PYTHON) $(IDF_PATH)/components/esptool_py/esptool.py --chip esp32
+ESPTOOLPY := $(PYTHON) $(COMPONENT_PATH)/esptool/esptool.py --chip esp32
 ESPTOOLPY_SERIAL := $(ESPTOOLPY) --port $(ESPPORT) --baud $(ESPBAUD)
 
-ESPTOOLPY_WRITE_FLASH=$(ESPTOOLPY_SERIAL) write_flash $(if $(CONFIG_ESPTOOLPY_COMPRESSED),-z)
+# the no-stub argument is temporary until esptool.py fully supports compressed uploads
+ESPTOOLPY_WRITE_FLASH=$(ESPTOOLPY_SERIAL) $(if $(CONFIG_ESPTOOLPY_COMPRESSED),--no-stub) write_flash $(if $(CONFIG_ESPTOOLPY_COMPRESSED),-z)
 
 ESPTOOL_ALL_FLASH_ARGS += $(CONFIG_APP_OFFSET) $(APP_BIN)