This is a workaround for the 'no-site-packages' bug in the version of
idf_tools.py shipped in v4.0 and v3.3.1 (see 7a18f02ac).
When installing IDF v4.0 and v3.3.1, the installer will use the
bundled version of idf_tools.py instead of the version which comes
with IDF.
* use Environment::Exit() to avoid PS process hanging
* old-fashioned exceptions
* try-catch-finally necessary
* disable Windows Defender Task when Defender module not installed
* cleanup script checks Defender module existence too
* fixed uninstall of Start Menu LNK
* use Command Prompt instead of Command Line wording
+ Desktop shortcut
* iterate through PSMODULEPATH when looking for WD module
JIRA IDFGH-2036
