ARDUINO_DIRECTORIES_DATA environnement variable as packagePath

[rgot-org]

as describe here https://arduino.github.io/arduino-cli/0.28/configuration/#environment-variables
add the ARDUINO_DIRECTORIES_DATA to define package directory.
the old preference.txt LOCALAPPDATA location is deprecated

[tshcherban]

@rgot-org can this PR be used to support portable mode for VSCode? i want arduino extension to install packages somewhere inside '...\vscode\data' directory, and not '< user>\appdata\arduino15'

[rgot-org]

with the modification i've defined an user variable ARDUINO_DIRECTORIES_DATA to "C:\ArduinoCLI\data" (my data folder location)
then vscode find all the data files in this location. with the user variable you can define the path as you want.

[lersi]

hello, I created a community fork at https://github.com/vscode-arduino/vscode-arduino.
You are more than welcome to merge your changes there.